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X in (-oo:+oo)
(15-X)/5 = (3-X)/10 // - (3-X)/10
(15-X)/5-((3-X)/10) = 0
(15-X)/5+(-1*(3-X))/10 = 0
(10*(15-X))/(5*10)+(-1*5*(3-X))/(5*10) = 0
10*(15-X)-1*5*(3-X) = 0
135-5*X = 0
(135-5*X)/(5*10) = 0
(135-5*X)/(5*10) = 0 // * 5*10
135-5*X = 0
135-5*X = 0 // - 135
-5*X = -135 // : -5
X = -135/(-5)
X = 27
X = 27
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