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30x+180=10x+500
We move all terms to the left:
30x+180-(10x+500)=0
We get rid of parentheses
30x-10x-500+180=0
We add all the numbers together, and all the variables
20x-320=0
We move all terms containing x to the left, all other terms to the right
20x=320
x=320/20
x=16
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