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72-12\times 3x=15-4\left(4x-3\right)
Multiply both sides of the equation by 24, the least common multiple of 2,8,6.
72-36x=15-4\left(4x-3\right)
Multiply -12 and 3 to get -36.
72-36x=15-16x+12
Use the distributive property to multiply -4 by 4x-3.
72-36x=27-16x
Add 15 and 12 to get 27.
72-36x+16x=27
Add 16x to both sides.
72-20x=27
Combine -36x and 16x to get -20x.
-20x=27-72
Subtract 72 from both sides.
-20x=-45
Subtract 72 from 27 to get -45.
x=\frac{-45}{-20}
Divide both sides by -20.
x=\frac{9}{4}
Reduce the fraction \frac{-45}{-20} to lowest terms by extracting and canceling out -5.