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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-7x+3x-9+21=0

We add all the numbers together, and all the variables

-4x+12=0

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

-4x=-12

x=-12/-4

x=+3

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