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-4+2x=20-4x
We move all terms to the left:
-4+2x-(20-4x)=0
We add all the numbers together, and all the variables
2x-(-4x+20)-4=0
We get rid of parentheses
2x+4x-20-4=0
We add all the numbers together, and all the variables
6x-24=0
We move all terms containing x to the left, all other terms to the right
6x=24
x=24/6
x=4
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