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20-8x-9x=1
Add 12 and 8 to get 20.
20-17x=1
Combine -8x and -9x to get -17x.
-17x=1-20
Subtract 20 from both sides.
-17x=-19
Subtract 20 from 1 to get -19.
x=\frac{-19}{-17}
Divide both sides by -17.
x=\frac{19}{17}
Fraction \frac{-19}{-17} can be simplified to \frac{19}{17} by removing the negative sign from both the numerator and the denominator.