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x-12+4x=-2x-28-x
We move all terms to the left:
x-12+4x-(-2x-28-x)=0
We add all the numbers together, and all the variables
x+4x-(-3x-28)-12=0
We add all the numbers together, and all the variables
5x-(-3x-28)-12=0
We get rid of parentheses
5x+3x+28-12=0
We add all the numbers together, and all the variables
8x+16=0
We move all terms containing x to the left, all other terms to the right
8x=-16
x=-16/8
x=-2
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