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x in (-oo:+oo)
(3/5)*x-(5*y) = 20 // - 20
(3/5)*x-(5*y)-20 = 0
(3/5)*x-5*y-20 = 0
3/5*x-5*y-20 = 0 // + -5*y-20
3/5*x = -(-5*y-20) // : 3/5
x = (-(-5*y-20))/3/5
x = 5/3*(20-(-5*y))
x = 5/3*(20-(-5*y))
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