-12=(3-x)*4

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



-12=(3-x)*4

We move all terms to the left:

-12-((3-x)*4)=0

We add all the numbers together, and all the variables

-((-1x+3)*4)-12=0



We calculate terms in parentheses: -((-1x+3)*4), so:

(-1x+3)*4

We multiply parentheses

-4x+12

Back to the equation:

-(-4x+12)



We get rid of parentheses

4x-12-12=0

We add all the numbers together, and all the variables

4x-24=0

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

4x=24

x=24/4

x=6

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