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x in (-oo:+oo)
(3/5)*x+(4/5)*y = 1/2 // - 1/2
(3/5)*x+(4/5)*y-(1/2) = 0
(3/5)*x+(4/5)*y-1/2 = 0
3/5*x+4/5*y-1/2 = 0 // - 4/5*y-1/2
3/5*x = -(4/5*y-1/2) // : 3/5
x = (-(4/5*y-1/2))/3/5
x = 5/3*(1/2-(4/5*y))
x = 5/3*(1/2-(4/5*y))
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