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100=2.5x
We move all terms to the left:
100-(2.5x)=0
We add all the numbers together, and all the variables
-(+2.5x)+100=0
We get rid of parentheses
-2.5x+100=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-100
x=-100/-2.5
x=+40
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