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x in (-oo:+oo)
y = (5*x-9)/2 // - (5*x-9)/2
y-((5*x-9)/2) = 0
(-1*(5*x-9))/2+y = 0
(-1*(5*x-9))/2+(2*y)/2 = 0
2*y-1*(5*x-9) = 0
2*y-5*x+9 = 0
(2*y-5*x+9)/2 = 0
(2*y-5*x+9)/2 = 0 // * 2
2*y-5*x+9 = 0
2*y-5*x+9 = 0 // - 2*y+9
-5*x = -(2*y+9) // : -5
x = (-(2*y+9))/(-5)
x = (2*y+9)/5
x = (2*y+9)/5
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