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100=20x+70+10x
We move all terms to the left:
100-(20x+70+10x)=0
We add all the numbers together, and all the variables
-(30x+70)+100=0
We get rid of parentheses
-30x-70+100=0
We add all the numbers together, and all the variables
-30x+30=0
We move all terms containing x to the left, all other terms to the right
-30x=-30
x=-30/-30
x=1
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