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3\left(x+4\right)+15=15x-5\left(x-3\right)
Multiply both sides of the equation by 15, the least common multiple of 5,3.
3x+12+15=15x-5\left(x-3\right)
Use the distributive property to multiply 3 by x+4.
3x+27=15x-5\left(x-3\right)
Add 12 and 15 to get 27.
3x+27=15x-5x+15
Use the distributive property to multiply -5 by x-3.
3x+27=10x+15
Combine 15x and -5x to get 10x.
3x+27-10x=15
Subtract 10x from both sides.
-7x+27=15
Combine 3x and -10x to get -7x.
-7x=15-27
Subtract 27 from both sides.
-7x=-12
Subtract 27 from 15 to get -12.
x=\frac{-12}{-7}
Divide both sides by -7.
x=\frac{12}{7}
Fraction \frac{-12}{-7} can be simplified to \frac{12}{7} by removing the negative sign from both the numerator and the denominator.