Question 888773
{{{-9(1+4a)-4=7-4(5a-7)}}} Start with the given equation.



{{{-9-36a-4=7-20a+28}}} Distribute.



{{{-13-36a=7-20a+28}}} Combine like terms on the left side.



{{{-13-36a=-20a+35}}} Combine like terms on the right side.



{{{-36a=-20a+35+13}}} Add {{{13}}} to both sides.



{{{-36a+20a=35+13}}} Add {{{20a}}} to both sides.



{{{-16a=35+13}}} Combine like terms on the left side.



{{{-16a=48}}} Combine like terms on the right side.



{{{a=(48)/(-16)}}} Divide both sides by {{{-16}}} to isolate {{{a}}}.



{{{a=-3}}} Reduce.



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Answer:


So the solution is {{{a=-3}}}