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x in (-oo:+oo)
y-10 = (5/2)*(x-3) // - (5/2)*(x-3)
y-((5/2)*(x-3))-10 = 0
(-5/2)*(x-3)+y-10 = 0
y-5/2*(x-3)-10 = 0
y-5/2*(x-3)-10 = 0
y-5/2*x-10+15/2 = 0
y-5/2*x-5/2 = 0
y-5/2*x-5/2 = 0
y-5/2*x-5/2 = 0 // - y-5/2
-5/2*x = -(y-5/2) // : -5/2
x = (-(y-5/2))/(-5/2)
x = -2/5*(5/2-y)
x = -2/5*(5/2-y)
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