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x in (-oo:+oo)
(3/2)*x+(5/2)*y = 20 // - 20
(3/2)*x+(5/2)*y-20 = 0
3/2*x+5/2*y-20 = 0 // - 5/2*y-20
3/2*x = -(5/2*y-20) // : 3/2
x = (-(5/2*y-20))/3/2
x = 2/3*(20-(5/2*y))
x = 2/3*(20-(5/2*y))
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