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4\times 5+4x\left(-3\right)=9-x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 4x, the least common multiple of x,4x.
20+4x\left(-3\right)=9-x
Multiply 4 and 5 to get 20.
20-12x=9-x
Multiply 4 and -3 to get -12.
20-12x+x=9
Add x to both sides.
20-11x=9
Combine -12x and x to get -11x.
-11x=9-20
Subtract 20 from both sides.
-11x=-11
Subtract 20 from 9 to get -11.
x=\frac{-11}{-11}
Divide both sides by -11.
x=1
Divide -11 by -11 to get 1.