7a+7(6-3a)=126

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Solution for 7a+7(6-3a)=126 equation: 



7a+7(6-3a)=126

We move all terms to the left:

7a+7(6-3a)-(126)=0

We add all the numbers together, and all the variables

7a+7(-3a+6)-126=0

We multiply parentheses

7a-21a+42-126=0

We add all the numbers together, and all the variables

-14a-84=0

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

-14a=84

a=84/-14

a=-6

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