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x in (-oo:+oo)
y = (3*x-15)/4 // - (3*x-15)/4
y-((3*x-15)/4) = 0
(-1*(3*x-15))/4+y = 0
(-1*(3*x-15))/4+(4*y)/4 = 0
4*y-1*(3*x-15) = 0
4*y-3*x+15 = 0
(4*y-3*x+15)/4 = 0
(4*y-3*x+15)/4 = 0 // * 4
4*y-3*x+15 = 0
4*y-3*x+15 = 0 // - 4*y+15
-3*x = -(4*y+15) // : -3
x = (-(4*y+15))/(-3)
x = (4*y+15)/3
x = (4*y+15)/3
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