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20+4x=2x+4
We move all terms to the left:
20+4x-(2x+4)=0
We get rid of parentheses
4x-2x-4+20=0
We add all the numbers together, and all the variables
2x+16=0
We move all terms containing x to the left, all other terms to the right
2x=-16
x=-16/2
x=-8
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