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500-20x=800-25x
We move all terms to the left:
500-20x-(800-25x)=0
We add all the numbers together, and all the variables
-20x-(-25x+800)+500=0
We get rid of parentheses
-20x+25x-800+500=0
We add all the numbers together, and all the variables
5x-300=0
We move all terms containing x to the left, all other terms to the right
5x=300
x=300/5
x=60
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