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81=5x+9+4x
We move all terms to the left:
81-(5x+9+4x)=0
We add all the numbers together, and all the variables
-(9x+9)+81=0
We get rid of parentheses
-9x-9+81=0
We add all the numbers together, and all the variables
-9x+72=0
We move all terms containing x to the left, all other terms to the right
-9x=-72
x=-72/-9
x=+8
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