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500-40x=200-60x
We move all terms to the left:
500-40x-(200-60x)=0
We add all the numbers together, and all the variables
-40x-(-60x+200)+500=0
We get rid of parentheses
-40x+60x-200+500=0
We add all the numbers together, and all the variables
20x+300=0
We move all terms containing x to the left, all other terms to the right
20x=-300
x=-300/20
x=-15
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