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100=x.2x
We move all terms to the left:
100-(x.2x)=0
We add all the numbers together, and all the variables
-(+x.2x)+100=0
We get rid of parentheses
-x.2x+100=0
We move all terms containing x to the left, all other terms to the right
-x.2x=-100
x=-100/1
x=-100
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