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100+30x=70+80x
We move all terms to the left:
100+30x-(70+80x)=0
We add all the numbers together, and all the variables
30x-(80x+70)+100=0
We get rid of parentheses
30x-80x-70+100=0
We add all the numbers together, and all the variables
-50x+30=0
We move all terms containing x to the left, all other terms to the right
-50x=-30
x=-30/-50
x=3/5
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