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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

12x-12x-21+21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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