7(1+3a)=91

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Solution for 7(1+3a)=91 equation: 



7(1+3a)=91

We move all terms to the left:

7(1+3a)-(91)=0

We add all the numbers together, and all the variables

7(3a+1)-91=0

We multiply parentheses

21a+7-91=0

We add all the numbers together, and all the variables

21a-84=0

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

21a=84

a=84/21

a=4

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