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100=50-0.5x
We move all terms to the left:
100-(50-0.5x)=0
We add all the numbers together, and all the variables
-(-0.5x+50)+100=0
We get rid of parentheses
0.5x-50+100=0
We add all the numbers together, and all the variables
0.5x+50=0
We move all terms containing x to the left, all other terms to the right
0.5x=-50
x=-50/0.5
x=-100
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