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3\left(x+3\right)=5\left(2x-5\right)-15
Multiply both sides of the equation by 15, the least common multiple of 5,3.
3x+9=5\left(2x-5\right)-15
Use the distributive property to multiply 3 by x+3.
3x+9=10x-25-15
Use the distributive property to multiply 5 by 2x-5.
3x+9=10x-40
Subtract 15 from -25 to get -40.
3x+9-10x=-40
Subtract 10x from both sides.
-7x+9=-40
Combine 3x and -10x to get -7x.
-7x=-40-9
Subtract 9 from both sides.
-7x=-49
Subtract 9 from -40 to get -49.
x=\frac{-49}{-7}
Divide both sides by -7.
x=7
Divide -49 by -7 to get 7.