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3\times 10+3\left(x-3\right)\left(-3\right)=12
Variable x cannot be equal to 3 since division by zero is not defined. Multiply both sides of the equation by 3\left(x-3\right), the least common multiple of x-3,3x-9.
30+3\left(x-3\right)\left(-3\right)=12
Multiply 3 and 10 to get 30.
30-9\left(x-3\right)=12
Multiply 3 and -3 to get -9.
30-9x+27=12
Use the distributive property to multiply -9 by x-3.
57-9x=12
Add 30 and 27 to get 57.
-9x=12-57
Subtract 57 from both sides.
-9x=-45
Subtract 57 from 12 to get -45.
x=\frac{-45}{-9}
Divide both sides by -9.
x=5
Divide -45 by -9 to get 5.