Question 829318
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{{{a(2x+1)+ b(x+1)}}}
{{{2ax+a+bx+b}}}
{{{2ax+bx+a+b}}}
{{{(2a+b)x+(a+b)}}}
Compare that to {{{2x+5}}}.

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Equate factors which are in corresponding locations for the form.
{{{2a+b=2}}} and {{{a+b=5}}}
SOLVE FOR a AND b.
I strongly suggest using Elimination Method if you know it; otherwise any way that you know, like substitution.



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You should quickly find a=-3 using Elimination Method....