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3\left(x-3\right)=5\left(x+1\right)-30
Multiply both sides of the equation by 15, the least common multiple of 5,3.
3x-9=5\left(x+1\right)-30
Use the distributive property to multiply 3 by x-3.
3x-9=5x+5-30
Use the distributive property to multiply 5 by x+1.
3x-9=5x-25
Subtract 30 from 5 to get -25.
3x-9-5x=-25
Subtract 5x from both sides.
-2x-9=-25
Combine 3x and -5x to get -2x.
-2x=-25+9
Add 9 to both sides.
-2x=-16
Add -25 and 9 to get -16.
x=\frac{-16}{-2}
Divide both sides by -2.
x=8
Divide -16 by -2 to get 8.