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72=27+9x
We move all terms to the left:
72-(27+9x)=0
We add all the numbers together, and all the variables
-(9x+27)+72=0
We get rid of parentheses
-9x-27+72=0
We add all the numbers together, and all the variables
-9x+45=0
We move all terms containing x to the left, all other terms to the right
-9x=-45
x=-45/-9
x=+5
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