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3\left(3x+2\right)-15=5x+75
Multiply both sides of the equation by 15, the least common multiple of 5,3.
9x+6-15=5x+75
Use the distributive property to multiply 3 by 3x+2.
9x-9=5x+75
Subtract 15 from 6 to get -9.
9x-9-5x=75
Subtract 5x from both sides.
4x-9=75
Combine 9x and -5x to get 4x.
4x=75+9
Add 9 to both sides.
4x=84
Add 75 and 9 to get 84.
x=\frac{84}{4}
Divide both sides by 4.
x=21
Divide 84 by 4 to get 21.