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4x-9=2x\times 10
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 4x,2.
4x-9=20x
Multiply 2 and 10 to get 20.
4x-9-20x=0
Subtract 20x from both sides.
-16x-9=0
Combine 4x and -20x to get -16x.
-16x=9
Add 9 to both sides. Anything plus zero gives itself.
x=\frac{9}{-16}
Divide both sides by -16.
x=-\frac{9}{16}
Fraction \frac{9}{-16} can be rewritten as -\frac{9}{16} by extracting the negative sign.