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300=1.5x
We move all terms to the left:
300-(1.5x)=0
We add all the numbers together, and all the variables
-(+1.5x)+300=0
We get rid of parentheses
-1.5x+300=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-300
x=-300/-1.5
x=+200
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