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x in (-oo:+oo)
y = (2/5)*x-6 // - (2/5)*x-6
y-((2/5)*x)+6 = 0
(-2/5)*x+y+6 = 0
y-2/5*x+6 = 0 // - y+6
-2/5*x = -(y+6) // : -2/5
x = (-(y+6))/(-2/5)
x = 5/2*(y+6)
x = 5/2*(y+6)
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