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18\left(x-1\right)+2\left(x+1\right)=9
Multiply both sides of the equation by 6, the least common multiple of 2,3.
18x-18+2\left(x+1\right)=9
Use the distributive property to multiply 18 by x-1.
18x-18+2x+2=9
Use the distributive property to multiply 2 by x+1.
20x-18+2=9
Combine 18x and 2x to get 20x.
20x-16=9
Add -18 and 2 to get -16.
20x=9+16
Add 16 to both sides.
20x=25
Add 9 and 16 to get 25.
x=\frac{25}{20}
Divide both sides by 20.
x=\frac{5}{4}
Reduce the fraction \frac{25}{20} to lowest terms by extracting and canceling out 5.