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200=0.50x-12x
We move all terms to the left:
200-(0.50x-12x)=0
We add all the numbers together, and all the variables
-(-11.5x)+200=0
We get rid of parentheses
11.5x+200=0
We move all terms containing x to the left, all other terms to the right
11.5x=-200
x=-200/11.5
x=-17+3/7.66666666667
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