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