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0=9x+7.2
We move all terms to the left:
0-(9x+7.2)=0
We add all the numbers together, and all the variables
-(9x+7.2)=0
We get rid of parentheses
-9x-7.2=0
We move all terms containing x to the left, all other terms to the right
-9x=7.2
x=7.2/-9
x=-6/7.5
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