-4(a=12)=42

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Solution for -4(a=12)=42 equation: 



-4(a=12)=42

We move all terms to the left:

-4(a-(12))=0

We multiply parentheses

-4a+48=0

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

-4a=-48

a=-48/-4

a=+12

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