-12(x=3)=4(x-21)

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Solution for -12(x=3)=4(x-21) equation: 



-12(x=3)=4(x-21)

We move all terms to the left:

-12(x-(3))=0

We multiply parentheses

-12x+36=0

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

-12x=-36

x=-36/-12

x=+3

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