[tex]\frac{3x-15}{3}-\frac{2x-6}{2} = \frac{2(3x-15)-3(2x-6)}{3\cdot2} = \frac{6x-30-6x+18}{6} =\frac{-12}{6} = -2[/tex]
[tex]lub\\\\\frac{3x-15}{3}-\frac{2x-6}{2} = \frac{3(x-5)}{3}-\frac{2(x-3)}{2} = x-5 - (x-3) = x-5-x+3 = -2[/tex]
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