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150=x+0.20x
We move all terms to the left:
150-(x+0.20x)=0
We add all the numbers together, and all the variables
-(+1.2x)+150=0
We get rid of parentheses
-1.2x+150=0
We move all terms containing x to the left, all other terms to the right
-1.2x=-150
x=-150/-1.2
x=+125
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