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100=0.50x+300
We move all terms to the left:
100-(0.50x+300)=0
We get rid of parentheses
-0.50x-300+100=0
We add all the numbers together, and all the variables
-0.5x-200=0
We move all terms containing x to the left, all other terms to the right
-0.5x=200
x=200/-0.5
x=-400
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