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-2x+81-2x=-x+9
We move all terms to the left:
-2x+81-2x-(-x+9)=0
We add all the numbers together, and all the variables
-2x-2x-(-1x+9)+81=0
We add all the numbers together, and all the variables
-4x-(-1x+9)+81=0
We get rid of parentheses
-4x+1x-9+81=0
We add all the numbers together, and all the variables
-3x+72=0
We move all terms containing x to the left, all other terms to the right
-3x=-72
x=-72/-3
x=+24
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