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9=x+1.5x
We move all terms to the left:
9-(x+1.5x)=0
We add all the numbers together, and all the variables
-(+2.5x)+9=0
We get rid of parentheses
-2.5x+9=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-9
x=-9/-2.5
x=3+1/1.66666666667
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