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x in (-oo:+oo)
y-6 = (7/8)*(x-5) // - (7/8)*(x-5)
y-((7/8)*(x-5))-6 = 0
(-7/8)*(x-5)+y-6 = 0
y-7/8*(x-5)-6 = 0
y-7/8*(x-5)-6 = 0
y-7/8*x-6+35/8 = 0
y-7/8*x-13/8 = 0
y-7/8*x-13/8 = 0
y-7/8*x-13/8 = 0 // - y-13/8
-7/8*x = -(y-13/8) // : -7/8
x = (-(y-13/8))/(-7/8)
x = -8/7*(13/8-y)
x = -8/7*(13/8-y)
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