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100x-100=4x+20
We move all terms to the left:
100x-100-(4x+20)=0
We get rid of parentheses
100x-4x-20-100=0
We add all the numbers together, and all the variables
96x-120=0
We move all terms containing x to the left, all other terms to the right
96x=120
x=120/96
x=1+1/4
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