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x in (-oo:+oo)
(x-3)/28 = (x-5)/15 // - (x-5)/15
(x-3)/28-((x-5)/15) = 0
(x-3)/28+(-1*(x-5))/15 = 0
(15*(x-3))/(15*28)+(-1*28*(x-5))/(15*28) = 0
15*(x-3)-1*28*(x-5) = 0
95-13*x = 0
(95-13*x)/(15*28) = 0
(95-13*x)/(15*28) = 0 // * 15*28
95-13*x = 0
95-13*x = 0 // - 95
-13*x = -95 // : -13
x = -95/(-13)
x = 95/13
x = 95/13
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