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4x+20=2x+56
We move all terms to the left:
4x+20-(2x+56)=0
We get rid of parentheses
4x-2x-56+20=0
We add all the numbers together, and all the variables
2x-36=0
We move all terms containing x to the left, all other terms to the right
2x=36
x=36/2
x=18
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