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8x+4=2x+20
We move all terms to the left:
8x+4-(2x+20)=0
We get rid of parentheses
8x-2x-20+4=0
We add all the numbers together, and all the variables
6x-16=0
We move all terms containing x to the left, all other terms to the right
6x=16
x=16/6
x=2+2/3
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