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m in (-oo:+oo)
(2/5)*m-6 = (1/5)*(m-15) // - (1/5)*(m-15)
(2/5)*m-((1/5)*(m-15))-6 = 0
(-1/5)*(m-15)+(2/5)*m-6 = 0
(2*m)/5-1/5*(m-15)-6 = 0
(-1/5*5*(m-15))/5+(2*m)/5+(-6*5)/5 = 0
2*m-1/5*5*(m-15)-6*5 = 0
m-30+15 = 0
m-15 = 0
(m-15)/5 = 0
(m-15)/5 = 0 // * 5
m-15 = 0
m-15 = 0 // + 15
m = 15
m = 15
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