6(5a-7)=138

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Solution for 6(5a-7)=138 equation: 



6(5a-7)=138

We move all terms to the left:

6(5a-7)-(138)=0

We multiply parentheses

30a-42-138=0

We add all the numbers together, and all the variables

30a-180=0

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

30a=180

a=180/30

a=6

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