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2x-3x+4=12-3x-20
We move all terms to the left:
2x-3x+4-(12-3x-20)=0
We add all the numbers together, and all the variables
2x-3x-(-3x-8)+4=0
We add all the numbers together, and all the variables
-1x-(-3x-8)+4=0
We get rid of parentheses
-1x+3x+8+4=0
We add all the numbers together, and all the variables
2x+12=0
We move all terms containing x to the left, all other terms to the right
2x=-12
x=-12/2
x=-6
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