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100=0.5x+55
We move all terms to the left:
100-(0.5x+55)=0
We get rid of parentheses
-0.5x-55+100=0
We add all the numbers together, and all the variables
-0.5x+45=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-45
x=-45/-0.5
x=+90
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