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x in (-oo:+oo)
y+9 = (8/7)*(x-6) // - (8/7)*(x-6)
y-((8/7)*(x-6))+9 = 0
(-8/7)*(x-6)+y+9 = 0
y-8/7*(x-6)+9 = 0
y-8/7*(x-6)+9 = 0
y-8/7*x+48/7+9 = 0
y-8/7*x+111/7 = 0
y-8/7*x+111/7 = 0
y-8/7*x+111/7 = 0 // - y+111/7
-8/7*x = -(y+111/7) // : -8/7
x = (-(y+111/7))/(-8/7)
x = 7/8*(y+111/7)
x = 7/8*(y+111/7)
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