-3x-12=4(x+1)-9

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Solution for -3x-12=4(x+1)-9 equation: 



-3x-12=4(x+1)-9

We move all terms to the left:

-3x-12-(4(x+1)-9)=0



We calculate terms in parentheses: -(4(x+1)-9), so:

4(x+1)-9

We multiply parentheses

4x+4-9

We add all the numbers together, and all the variables

4x-5

Back to the equation:

-(4x-5)



We get rid of parentheses

-3x-4x+5-12=0

We add all the numbers together, and all the variables

-7x-7=0

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

-7x=7

x=7/-7

x=-1

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