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x in (-oo:+oo)
Y-9 = (1/6)*(x-5) // - (1/6)*(x-5)
Y-((1/6)*(x-5))-9 = 0
(-1/6)*(x-5)+Y-9 = 0
Y-1/6*(x-5)-9 = 0
Y-1/6*(x-5)-9 = 0
Y-1/6*x-9+5/6 = 0
Y-1/6*x-49/6 = 0
Y-1/6*x-49/6 = 0
Y-1/6*x-49/6 = 0 // - Y-49/6
-1/6*x = -(Y-49/6) // : -1/6
x = (-(Y-49/6))/(-1/6)
x = -6*(49/6-Y)
x = -6*(49/6-Y)
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