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x in (-oo:+oo)
(4/5)*x-(5*y) = 3 // - 3
(4/5)*x-(5*y)-3 = 0
(4/5)*x-5*y-3 = 0
4/5*x-5*y-3 = 0 // + -5*y-3
4/5*x = -(-5*y-3) // : 4/5
x = (-(-5*y-3))/4/5
x = 5/4*(3-(-5*y))
x = 5/4*(3-(-5*y))
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