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20+4x=120+3x
We move all terms to the left:
20+4x-(120+3x)=0
We add all the numbers together, and all the variables
4x-(3x+120)+20=0
We get rid of parentheses
4x-3x-120+20=0
We add all the numbers together, and all the variables
x-100=0
We move all terms containing x to the left, all other terms to the right
x=100
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