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m in (-oo:+oo)
(m-13)/3-((5*m-15)/5) = 2 // - 2
(m-13)/3-((5*m-15)/5)-2 = 0
(m-13)/3+(-1*(5*m-15))/5-2 = 0
(5*(m-13))/(3*5)+(-1*3*(5*m-15))/(3*5)+(-2*3*5)/(3*5) = 0
5*(m-13)-1*3*(5*m-15)-2*3*5 = 0
-10*m-30-20 = 0
-10*m-50 = 0
(-10*m-50)/(3*5) = 0
(-10*m-50)/(3*5) = 0 // * 3*5
-10*m-50 = 0
-10*m-50 = 0 // + 50
-10*m = 50 // : -10
m = 50/(-10)
m = -5
m = -5
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