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x in (-oo:+oo)
y-9 = (6/5)*(x+6) // - (6/5)*(x+6)
y-((6/5)*(x+6))-9 = 0
(-6/5)*(x+6)+y-9 = 0
y-6/5*(x+6)-9 = 0
y-6/5*(x+6)-9 = 0
y-6/5*x-9-36/5 = 0
y-6/5*x-81/5 = 0
y-6/5*x-81/5 = 0
y-6/5*x-81/5 = 0 // - y-81/5
-6/5*x = -(y-81/5) // : -6/5
x = (-(y-81/5))/(-6/5)
x = -5/6*(81/5-y)
x = -5/6*(81/5-y)
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