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