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x-\left(x-3\right)\times 4=\left(x-3\right)\times 3
Variable x cannot be equal to 3 since division by zero is not defined. Multiply both sides of the equation by \left(x-3\right)^{2}, the least common multiple of x^{2}-6x+9,x-3.
x-\left(4x-12\right)=\left(x-3\right)\times 3
Use the distributive property to multiply x-3 by 4.
x-4x+12=\left(x-3\right)\times 3
To find the opposite of 4x-12, find the opposite of each term.
-3x+12=\left(x-3\right)\times 3
Combine x and -4x to get -3x.
-3x+12=3x-9
Use the distributive property to multiply x-3 by 3.
-3x+12-3x=-9
Subtract 3x from both sides.
-6x+12=-9
Combine -3x and -3x to get -6x.
-6x=-9-12
Subtract 12 from both sides.
-6x=-21
Subtract 12 from -9 to get -21.
x=\frac{-21}{-6}
Divide both sides by -6.
x=\frac{7}{2}
Reduce the fraction \frac{-21}{-6} to lowest terms by extracting and canceling out -3.