Solve for x
x=9
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1+8\left(-x\right)+80=9
Use the distributive property to multiply 8 by -x+10.
81+8\left(-x\right)=9
Add 1 and 80 to get 81.
8\left(-x\right)=9-81
Subtract 81 from both sides.
8\left(-x\right)=-72
Subtract 81 from 9 to get -72.
-x=\frac{-72}{8}
Divide both sides by 8.
-x=-9
Divide -72 by 8 to get -9.
x=9
Multiply both sides by -1.
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