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150-1.5x=210-3x
We move all terms to the left:
150-1.5x-(210-3x)=0
We add all the numbers together, and all the variables
-1.5x-(-3x+210)+150=0
We get rid of parentheses
-1.5x+3x-210+150=0
We add all the numbers together, and all the variables
1.5x-60=0
We move all terms containing x to the left, all other terms to the right
1.5x=60
x=60/1.5
x=40
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