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