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x in (-oo:+oo)
y+7 = (-7/8)*(x+3) // - (-7/8)*(x+3)
y-((-7/8)*(x+3))+7 = 0
(7/8)*(x+3)+y+7 = 0
7/8*(x+3)+y+7 = 0
7/8*(x+3)+y+7 = 0
7/8*x+y+21/8+7 = 0
7/8*x+y+77/8 = 0
7/8*x+y+77/8 = 0
7/8*x+y+77/8 = 0 // - y+77/8
7/8*x = -(y+77/8) // : 7/8
x = (-(y+77/8))/7/8
x = -8/7*(y+77/8)
x = -8/7*(y+77/8)
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