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x in (-oo:+oo)
y+6 = (9/5)*(x-6) // - (9/5)*(x-6)
y-((9/5)*(x-6))+6 = 0
(-9/5)*(x-6)+y+6 = 0
y-9/5*(x-6)+6 = 0
y-9/5*(x-6)+6 = 0
y-9/5*x+6+54/5 = 0
y-9/5*x+84/5 = 0
y-9/5*x+84/5 = 0
y-9/5*x+84/5 = 0 // - y+84/5
-9/5*x = -(y+84/5) // : -9/5
x = (-(y+84/5))/(-9/5)
x = 5/9*(y+84/5)
x = 5/9*(y+84/5)
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