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x in (-oo:+oo)
y+7 = (-5/2)*(x+8) // - (-5/2)*(x+8)
y-((-5/2)*(x+8))+7 = 0
(5/2)*(x+8)+y+7 = 0
5/2*(x+8)+y+7 = 0
5/2*(x+8)+y+7 = 0
5/2*x+y+7+20 = 0
5/2*x+y+27 = 0
5/2*x+y+27 = 0
5/2*x+y+27 = 0 // - y+27
5/2*x = -(y+27) // : 5/2
x = (-(y+27))/5/2
x = -2/5*(y+27)
x = -2/5*(y+27)
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