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