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8x=4x+100
We move all terms to the left:
8x-(4x+100)=0
We get rid of parentheses
8x-4x-100=0
We add all the numbers together, and all the variables
4x-100=0
We move all terms containing x to the left, all other terms to the right
4x=100
x=100/4
x=25
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