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This is somewhat more formal contract terminology than "agree". ("Convenir" or "comprometerse" are often rendered as "to undertake to..." in English-language contracts." Although "ambas partes" may be used in Spanish, "both parties" is in fact redundant in English and can be rendered simply as "the parties." The "doublet" "agree and undertake" is likewise common contract legalese.

Examples:

(2) The undersigned registrants hereby undertake as follows: that prior to any public reoffering of the securities registered hereunder through use of a ...
sec.edgar-online.com/2005/05/02/0001193125-05-092563/Section34.asp

Now, therefore, I hereby undertake as follows:. i). I undertake to abide by the Programme & Advertising Codes laid down by the ...
www.mib.nic.in/informationb/CODES/FORM-2.pdf

Now, therefore, I hereby undertake as follows:. i). I undertake to abide by the Programme & Advertising Codes laid down by the ...
www.mib.nic.in/informationb/CODES/FORM-2.pdf

Now, therefore, I hereby undertake as follows:. i). I undertake to abide by the Programme & Advertising Codes laid down by the ...
www.mib.nic.in/informationb/CODES/FORM-2.pdf

(a) Each of the parties and the mediator undertake as follows:-. (i) Unless they otherwise agree the mediation shall be conducted in private and they will ...
www.lawsoc-ni.org/download/adr/ADR_Agreement.doc -

The parties agree and undertake as follows:. • Definitions: In this agreement,. “anticompetitive conduct” means that [ INDIVIDUAL X ] [ entered into an ...
www.competitionbureau.gc.ca/epic/site/cb-bc.nsf/en/02481e.h...

... referred to as “the Guarantor”) hereby agree and undertake as follows: .... referred to as “the Guarantor”) hereby agree and undertake as follows: ...
www.sla.gov.sg/Land_Sales/Appendix C - ST78.pdf