(7a+9)3+6=138

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



(7a+9)3+6=138

We move all terms to the left:

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

We add all the numbers together, and all the variables

(7a+9)3-132=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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