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x in (-oo:+oo)
y+6 = (7/8)*(x-9) // - (7/8)*(x-9)
y-((7/8)*(x-9))+6 = 0
(-7/8)*(x-9)+y+6 = 0
y-7/8*(x-9)+6 = 0
y-7/8*(x-9)+6 = 0
y-7/8*x+6+63/8 = 0
y-7/8*x+111/8 = 0
y-7/8*x+111/8 = 0
y-7/8*x+111/8 = 0 // - y+111/8
-7/8*x = -(y+111/8) // : -7/8
x = (-(y+111/8))/(-7/8)
x = 8/7*(y+111/8)
x = 8/7*(y+111/8)
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