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x in (-oo:+oo)
y-6 = (5/8)*(x-4) // - (5/8)*(x-4)
y-((5/8)*(x-4))-6 = 0
(-5/8)*(x-4)+y-6 = 0
y-5/8*(x-4)-6 = 0
y-5/8*(x-4)-6 = 0
y-5/8*x-6+5/2 = 0
y-5/8*x-7/2 = 0
y-5/8*x-7/2 = 0
y-5/8*x-7/2 = 0 // - y-7/2
-5/8*x = -(y-7/2) // : -5/8
x = (-(y-7/2))/(-5/8)
x = -8/5*(7/2-y)
x = -8/5*(7/2-y)
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