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100-4x=8x-104
We move all terms to the left:
100-4x-(8x-104)=0
We get rid of parentheses
-4x-8x+104+100=0
We add all the numbers together, and all the variables
-12x+204=0
We move all terms containing x to the left, all other terms to the right
-12x=-204
x=-204/-12
x=+17
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