12=(x+1)(-3)

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Solution for 12=(x+1)(-3) equation: 



12=(x+1)(-3)

We move all terms to the left:

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

We multiply parentheses ..

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



We calculate terms in parentheses: -((-3x-3)), so:

(-3x-3)

We get rid of parentheses

-3x-3

Back to the equation:

-(-3x-3)



We get rid of parentheses

3x+3+12=0

We add all the numbers together, and all the variables

3x+15=0

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

3x=-15

x=-15/3

x=-5

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