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x in (-oo:+oo)
y-4 = (1/8)*(x-5) // - (1/8)*(x-5)
y-((1/8)*(x-5))-4 = 0
(-1/8)*(x-5)+y-4 = 0
y-1/8*(x-5)-4 = 0
y-1/8*(x-5)-4 = 0
y-1/8*x-4+5/8 = 0
y-1/8*x-27/8 = 0
y-1/8*x-27/8 = 0
y-1/8*x-27/8 = 0 // - y-27/8
-1/8*x = -(y-27/8) // : -1/8
x = (-(y-27/8))/(-1/8)
x = -8*(27/8-y)
x = -8*(27/8-y)
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