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81+81-9\times 9=81x
Multiply both sides of the equation by 9.
162-9\times 9=81x
Add 81 and 81 to get 162.
162-81=81x
Multiply -9 and 9 to get -81.
81=81x
Subtract 81 from 162 to get 81.
81x=81
Swap sides so that all variable terms are on the left hand side.
x=\frac{81}{81}
Divide both sides by 81.
x=1
Divide 81 by 81 to get 1.