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-72=0.9x
We move all terms to the left:
-72-(0.9x)=0
We add all the numbers together, and all the variables
-(+0.9x)-72=0
We get rid of parentheses
-0.9x-72=0
We move all terms containing x to the left, all other terms to the right
-0.9x=72
x=72/-0.9
x=-80
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