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x in (-oo:+oo)
(7/2)*x+(5/2)*y = -25 // + 25
(7/2)*x+(5/2)*y+25 = 0
7/2*x+5/2*y+25 = 0 // - 5/2*y+25
7/2*x = -(5/2*y+25) // : 7/2
x = (-(5/2*y+25))/7/2
x = -2/7*(5/2*y+25)
x = -2/7*(5/2*y+25)
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