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3x-15+2x-5=9x
Multiply both sides of the equation by 3.
5x-15-5=9x
Combine 3x and 2x to get 5x.
5x-20=9x
Subtract 5 from -15 to get -20.
5x-20-9x=0
Subtract 9x from both sides.
-4x-20=0
Combine 5x and -9x to get -4x.
-4x=20
Add 20 to both sides. Anything plus zero gives itself.
x=\frac{20}{-4}
Divide both sides by -4.
x=-5
Divide 20 by -4 to get -5.