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12x-6-5\left(x+3\right)=3\left(x+5\right)-24
Multiply both sides of the equation by 6, the least common multiple of 6,2.
12x-6-5x-15=3\left(x+5\right)-24
Use the distributive property to multiply -5 by x+3.
7x-6-15=3\left(x+5\right)-24
Combine 12x and -5x to get 7x.
7x-21=3\left(x+5\right)-24
Subtract 15 from -6 to get -21.
7x-21=3x+15-24
Use the distributive property to multiply 3 by x+5.
7x-21=3x-9
Subtract 24 from 15 to get -9.
7x-21-3x=-9
Subtract 3x from both sides.
4x-21=-9
Combine 7x and -3x to get 4x.
4x=-9+21
Add 21 to both sides.
4x=12
Add -9 and 21 to get 12.
x=\frac{12}{4}
Divide both sides by 4.
x=3
Divide 12 by 4 to get 3.