7(1+a)+4a=84

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Solution for 7(1+a)+4a=84 equation: 



7(1+a)+4a=84

We move all terms to the left:

7(1+a)+4a-(84)=0

We add all the numbers together, and all the variables

7(a+1)+4a-84=0

We add all the numbers together, and all the variables

4a+7(a+1)-84=0

We multiply parentheses

4a+7a+7-84=0

We add all the numbers together, and all the variables

11a-77=0

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

11a=77

a=77/11

a=7

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