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x in (-oo:+oo)
(10*x+9*x-15+3)/15 = x+1 // - x+1
(10*x+9*x-15+3)/15-x-1 = 0
(19*x-12)/15-x-1 = 0
(19*x-12)/15+(15*(-x))/15+(-1*15)/15 = 0
19*x+15*(-x)-1*15-12 = 0
4*x-15-12 = 0
4*x-27 = 0
(4*x-27)/15 = 0
(4*x-27)/15 = 0 // * 15
4*x-27 = 0
4*x-27 = 0 // + 27
4*x = 27 // : 4
x = 27/4
x = 27/4
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