4a+3(a+7)=91

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Solution for 4a+3(a+7)=91 equation: 



4a+3(a+7)=91

We move all terms to the left:

4a+3(a+7)-(91)=0

We multiply parentheses

4a+3a+21-91=0

We add all the numbers together, and all the variables

7a-70=0

We move all terms containing a to the left, all other terms to the right

7a=70

a=70/7

a=10

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