7(a-84)=42

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Solution for 7(a-84)=42 equation: 



7(a-84)=42

We move all terms to the left:

7(a-84)-(42)=0

We multiply parentheses

7a-588-42=0

We add all the numbers together, and all the variables

7a-630=0

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

7a=630

a=630/7

a=90

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