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20x-150=15x-90
We move all terms to the left:
20x-150-(15x-90)=0
We get rid of parentheses
20x-15x+90-150=0
We add all the numbers together, and all the variables
5x-60=0
We move all terms containing x to the left, all other terms to the right
5x=60
x=60/5
x=12
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