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x in (-oo:+oo)
(9/2)*x+(7/2)*y = 39 // - 39
(9/2)*x+(7/2)*y-39 = 0
9/2*x+7/2*y-39 = 0 // - 7/2*y-39
9/2*x = -(7/2*y-39) // : 9/2
x = (-(7/2*y-39))/9/2
x = 2/9*(39-(7/2*y))
x = 2/9*(39-(7/2*y))
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