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15x-220=40-5x
We move all terms to the left:
15x-220-(40-5x)=0
We add all the numbers together, and all the variables
15x-(-5x+40)-220=0
We get rid of parentheses
15x+5x-40-220=0
We add all the numbers together, and all the variables
20x-260=0
We move all terms containing x to the left, all other terms to the right
20x=260
x=260/20
x=13
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