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12x+15=3\left(2x-7\right)+3
Multiply both sides of the equation by 3.
12x+15=6x-21+3
Use the distributive property to multiply 3 by 2x-7.
12x+15=6x-18
Add -21 and 3 to get -18.
12x+15-6x=-18
Subtract 6x from both sides.
6x+15=-18
Combine 12x and -6x to get 6x.
6x=-18-15
Subtract 15 from both sides.
6x=-33
Subtract 15 from -18 to get -33.
x=\frac{-33}{6}
Divide both sides by 6.
x=-\frac{11}{2}
Reduce the fraction \frac{-33}{6} to lowest terms by extracting and canceling out 3.