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6\left(x-9\right)-\left(3x-9\right)=\left(-6-2x\right)\times 2
Variable x cannot be equal to any of the values -3,3 since division by zero is not defined. Multiply both sides of the equation by 6\left(x-3\right)\left(x+3\right), the least common multiple of x^{2}-9,2x+6,9-3x.
6x-54-\left(3x-9\right)=\left(-6-2x\right)\times 2
Use the distributive property to multiply 6 by x-9.
6x-54-3x+9=\left(-6-2x\right)\times 2
To find the opposite of 3x-9, find the opposite of each term.
3x-54+9=\left(-6-2x\right)\times 2
Combine 6x and -3x to get 3x.
3x-45=\left(-6-2x\right)\times 2
Add -54 and 9 to get -45.
3x-45=-12-4x
Use the distributive property to multiply -6-2x by 2.
3x-45+4x=-12
Add 4x to both sides.
7x-45=-12
Combine 3x and 4x to get 7x.
7x=-12+45
Add 45 to both sides.
7x=33
Add -12 and 45 to get 33.
x=\frac{33}{7}
Divide both sides by 7.