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3x+80=5x-20=4x-10
We move all terms to the left:
3x+80-(5x-20)=0
We get rid of parentheses
3x-5x+20+80=0
We add all the numbers together, and all the variables
-2x+100=0
We move all terms containing x to the left, all other terms to the right
-2x=-100
x=-100/-2
x=+50
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