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30x-(3x-30x+100)=0
We add all the numbers together, and all the variables
30x-(-27x+100)=0
We get rid of parentheses
30x+27x-100=0
We add all the numbers together, and all the variables
57x-100=0
We move all terms containing x to the left, all other terms to the right
57x=100
x=100/57
x=1+43/57
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