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500=0.28x-x
We move all terms to the left:
500-(0.28x-x)=0
We add all the numbers together, and all the variables
-(-0.72x)+500=0
We get rid of parentheses
0.72x+500=0
We move all terms containing x to the left, all other terms to the right
0.72x=-500
x=-500/0.72
x=-694+0.31999999999999/0.72
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