(-x)(-3)=12

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



(-x)(-3)=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

(-1x)(-3)-12=0

We multiply parentheses ..

(+3x)-12=0

We get rid of parentheses

3x-12=0

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

3x=12

x=12/3

x=4

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