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0=1.5x+21
We move all terms to the left:
0-(1.5x+21)=0
We add all the numbers together, and all the variables
-(1.5x+21)=0
We get rid of parentheses
-1.5x-21=0
We move all terms containing x to the left, all other terms to the right
-1.5x=21
x=21/-1.5
x=-14
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