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12-4x=20-5x
We move all terms to the left:
12-4x-(20-5x)=0
We add all the numbers together, and all the variables
-4x-(-5x+20)+12=0
We get rid of parentheses
-4x+5x-20+12=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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