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4\times 2-x=2\left(9-x\right)X
Multiply both sides of the equation by 4x^{2}, the least common multiple of x^{2},4x,2x^{2}.
8-x=2\left(9-x\right)X
Multiply 4 and 2 to get 8.
8-x=\left(18-2x\right)X
Use the distributive property to multiply 2 by 9-x.
8-x=18X-2xX
Use the distributive property to multiply 18-2x by X.
18X-2xX=8-x
Swap sides so that all variable terms are on the left hand side.
\left(18-2x\right)X=8-x
Combine all terms containing X.
\frac{\left(18-2x\right)X}{18-2x}=\frac{8-x}{18-2x}
Divide both sides by 18-2x.
X=\frac{8-x}{18-2x}
Dividing by 18-2x undoes the multiplication by 18-2x.
X=\frac{8-x}{2\left(9-x\right)}
Divide 8-x by 18-2x.