3(3+7a)=135

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Solution for 3(3+7a)=135 equation: 



3(3+7a)=135

We move all terms to the left:

3(3+7a)-(135)=0

We add all the numbers together, and all the variables

3(7a+3)-135=0

We multiply parentheses

21a+9-135=0

We add all the numbers together, and all the variables

21a-126=0

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

21a=126

a=126/21

a=6

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