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3+x=x\left(9-1\right)
Divide 9 by 3 to get 3.
3+x=x\times 8
Subtract 1 from 9 to get 8.
3+x-x\times 8=0
Subtract x\times 8 from both sides.
3-7x=0
Combine x and -x\times 8 to get -7x.
-7x=-3
Subtract 3 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-3}{-7}
Divide both sides by -7.
x=\frac{3}{7}
Fraction \frac{-3}{-7} can be simplified to \frac{3}{7} by removing the negative sign from both the numerator and the denominator.