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x in (-oo:+oo)
y+6 = (7/8)*(x-4) // - (7/8)*(x-4)
y-((7/8)*(x-4))+6 = 0
(-7/8)*(x-4)+y+6 = 0
y-7/8*(x-4)+6 = 0
y-7/8*(x-4)+6 = 0
y-7/8*x+7/2+6 = 0
y-7/8*x+19/2 = 0
y-7/8*x+19/2 = 0
y-7/8*x+19/2 = 0 // - y+19/2
-7/8*x = -(y+19/2) // : -7/8
x = (-(y+19/2))/(-7/8)
x = 8/7*(y+19/2)
x = 8/7*(y+19/2)
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