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