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12-8x=40-4x
We move all terms to the left:
12-8x-(40-4x)=0
We add all the numbers together, and all the variables
-8x-(-4x+40)+12=0
We get rid of parentheses
-8x+4x-40+12=0
We add all the numbers together, and all the variables
-4x-28=0
We move all terms containing x to the left, all other terms to the right
-4x=28
x=28/-4
x=-7
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