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-13=-5x+15+3x-12+6x
We move all terms to the left:
-13-(-5x+15+3x-12+6x)=0
We add all the numbers together, and all the variables
-(4x+3)-13=0
We get rid of parentheses
-4x-3-13=0
We add all the numbers together, and all the variables
-4x-16=0
We move all terms containing x to the left, all other terms to the right
-4x=16
x=16/-4
x=-4
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