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500+15x=300+20x
We move all terms to the left:
500+15x-(300+20x)=0
We add all the numbers together, and all the variables
15x-(20x+300)+500=0
We get rid of parentheses
15x-20x-300+500=0
We add all the numbers together, and all the variables
-5x+200=0
We move all terms containing x to the left, all other terms to the right
-5x=-200
x=-200/-5
x=+40
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