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-12=-4+5+3x
We move all terms to the left:
-12-(-4+5+3x)=0
We add all the numbers together, and all the variables
-(3x+1)-12=0
We get rid of parentheses
-3x-1-12=0
We add all the numbers together, and all the variables
-3x-13=0
We move all terms containing x to the left, all other terms to the right
-3x=13
x=13/-3
x=-4+1/3
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