72=81-x

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Solution for 72=81-x equation:



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

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