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3\left(3x+1\right)-5\left(2x+3\right)=15x-60
Multiply both sides of the equation by 15, the least common multiple of 5,3.
9x+3-5\left(2x+3\right)=15x-60
Use the distributive property to multiply 3 by 3x+1.
9x+3-10x-15=15x-60
Use the distributive property to multiply -5 by 2x+3.
-x+3-15=15x-60
Combine 9x and -10x to get -x.
-x-12=15x-60
Subtract 15 from 3 to get -12.
-x-12-15x=-60
Subtract 15x from both sides.
-16x-12=-60
Combine -x and -15x to get -16x.
-16x=-60+12
Add 12 to both sides.
-16x=-48
Add -60 and 12 to get -48.
x=\frac{-48}{-16}
Divide both sides by -16.
x=3
Divide -48 by -16 to get 3.