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5x-30=2x+120
We move all terms to the left:
5x-30-(2x+120)=0
We get rid of parentheses
5x-2x-120-30=0
We add all the numbers together, and all the variables
3x-150=0
We move all terms containing x to the left, all other terms to the right
3x=150
x=150/3
x=50
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