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4x+100=2x+30
We move all terms to the left:
4x+100-(2x+30)=0
We get rid of parentheses
4x-2x-30+100=0
We add all the numbers together, and all the variables
2x+70=0
We move all terms containing x to the left, all other terms to the right
2x=-70
x=-70/2
x=-35
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