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x in (-oo:+oo)
y+4 = (-7/8)*(x-4) // - (-7/8)*(x-4)
y-((-7/8)*(x-4))+4 = 0
(7/8)*(x-4)+y+4 = 0
7/8*(x-4)+y+4 = 0
7/8*(x-4)+y+4 = 0
7/8*x+y-7/2+4 = 0
7/8*x+y+1/2 = 0
7/8*x+y+1/2 = 0
7/8*x+y+1/2 = 0 // - y+1/2
7/8*x = -(y+1/2) // : 7/8
x = (-(y+1/2))/7/8
x = -8/7*(y+1/2)
x = -8/7*(y+1/2)
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