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