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100-20x=20+10x
We move all terms to the left:
100-20x-(20+10x)=0
We add all the numbers together, and all the variables
-20x-(10x+20)+100=0
We get rid of parentheses
-20x-10x-20+100=0
We add all the numbers together, and all the variables
-30x+80=0
We move all terms containing x to the left, all other terms to the right
-30x=-80
x=-80/-30
x=2+2/3
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