(4x-12)=(-2x-21)

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Solution for (4x-12)=(-2x-21) equation: 



(4x-12)=(-2x-21)

We move all terms to the left:

(4x-12)-((-2x-21))=0

We get rid of parentheses

4x-((-2x-21))-12=0



We calculate terms in parentheses: -((-2x-21)), so:

(-2x-21)

We get rid of parentheses

-2x-21

Back to the equation:

-(-2x-21)



We get rid of parentheses

4x+2x+21-12=0

We add all the numbers together, and all the variables

6x+9=0

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

6x=-9

x=-9/6

x=-1+1/2

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