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x in (-oo:+oo)
y+1 = (7/8)*(x-9) // - (7/8)*(x-9)
y-((7/8)*(x-9))+1 = 0
(-7/8)*(x-9)+y+1 = 0
y-7/8*(x-9)+1 = 0
y-7/8*(x-9)+1 = 0
y-7/8*x+1+63/8 = 0
y-7/8*x+71/8 = 0
y-7/8*x+71/8 = 0
y-7/8*x+71/8 = 0 // - y+71/8
-7/8*x = -(y+71/8) // : -7/8
x = (-(y+71/8))/(-7/8)
x = 8/7*(y+71/8)
x = 8/7*(y+71/8)
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