7(a-4)=42

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Solution for 7(a-4)=42 equation: 



7(a-4)=42

We move all terms to the left:

7(a-4)-(42)=0

We multiply parentheses

7a-28-42=0

We add all the numbers together, and all the variables

7a-70=0

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

7a=70

a=70/7

a=10

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