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x in (-oo:+oo)
(9/2)*x+(7/2)*y = -49 // + 49
(9/2)*x+(7/2)*y+49 = 0
9/2*x+7/2*y+49 = 0 // - 7/2*y+49
9/2*x = -(7/2*y+49) // : 9/2
x = (-(7/2*y+49))/9/2
x = -2/9*(7/2*y+49)
x = -2/9*(7/2*y+49)
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