-4x+3(-7x-21)=12

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Solution for -4x+3(-7x-21)=12 equation: 



-4x+3(-7x-21)=12

We move all terms to the left:

-4x+3(-7x-21)-(12)=0

We multiply parentheses

-4x-21x-63-12=0

We add all the numbers together, and all the variables

-25x-75=0

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

-25x=75

x=75/-25

x=-3

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