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5x-30=3x+100
We move all terms to the left:
5x-30-(3x+100)=0
We get rid of parentheses
5x-3x-100-30=0
We add all the numbers together, and all the variables
2x-130=0
We move all terms containing x to the left, all other terms to the right
2x=130
x=130/2
x=65
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