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x in (-oo:+oo)
(X+6)/10+(x-4)/15 = 0
(15*(X+6))/(10*15)+(10*(x-4))/(10*15) = 0
15*(X+6)+10*(x-4) = 0
15*X+10*x+50 = 0
(15*X+10*x+50)/(10*15) = 0
(15*X+10*x+50)/(10*15) = 0 // * 10*15
15*X+10*x+50 = 0
15*X+10*x+50 = 0 // - 15*X+50
10*x = -(15*X+50) // : 10
x = (-(15*X+50))/10
x = (-(15*X+50))/10
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