6+3(7a+9)=138

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Solution for 6+3(7a+9)=138 equation: 



6+3(7a+9)=138

We move all terms to the left:

6+3(7a+9)-(138)=0

We add all the numbers together, and all the variables

3(7a+9)-132=0

We multiply parentheses

21a+27-132=0

We add all the numbers together, and all the variables

21a-105=0

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

21a=105

a=105/21

a=5

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