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80-x=3x-20
We move all terms to the left:
80-x-(3x-20)=0
We add all the numbers together, and all the variables
-1x-(3x-20)+80=0
We get rid of parentheses
-1x-3x+20+80=0
We add all the numbers together, and all the variables
-4x+100=0
We move all terms containing x to the left, all other terms to the right
-4x=-100
x=-100/-4
x=+25
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