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x in (-oo:+oo)
(X+6)/10+(x-4)/15 = (x+2)/6 // - (x+2)/6
(X+6)/10+(x-4)/15-((x+2)/6) = 0
(X+6)/10+(x-4)/15+(-1*(x+2))/6 = 0
(6*15*(X+6))/(6*10*15)+(6*10*(x-4))/(6*10*15)+(-1*10*15*(x+2))/(6*10*15) = 0
6*15*(X+6)+6*10*(x-4)-1*10*15*(x+2) = 0
90*X+60*x-150*x-300+300 = 0
90*X-90*x = 0
(90*X-90*x)/(6*10*15) = 0
(90*X-90*x)/(6*10*15) = 0 // * 6*10*15
90*X-90*x = 0
90*X-90*x = 0 // - 90*X
-90*x = -(90*X) // : -90
x = (-(90*X))/(-90)
x = X
x = X
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