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500=0.5x+125
We move all terms to the left:
500-(0.5x+125)=0
We get rid of parentheses
-0.5x-125+500=0
We add all the numbers together, and all the variables
-0.5x+375=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-375
x=-375/-0.5
x=+750
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