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4x-5x+12=-8x
We move all terms to the left:
4x-5x+12-(-8x)=0
We add all the numbers together, and all the variables
-1x-(-8x)+12=0
We get rid of parentheses
-1x+8x+12=0
We add all the numbers together, and all the variables
7x+12=0
We move all terms containing x to the left, all other terms to the right
7x=-12
x=-12/7
x=-1+5/7
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