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x in (-oo:+oo)
y = (1/5)*(109-(9*x)) // - (1/5)*(109-(9*x))
y-((1/5)*(109-(9*x))) = 0
(-1/5)*(109-9*x)+y = 0
y-1/5*(109-9*x) = 0
y-1/5*(109-9*x) = 0
9/5*x+y-109/5 = 0
9/5*x+y-109/5 = 0
9/5*x+y-109/5 = 0 // - y-109/5
9/5*x = -(y-109/5) // : 9/5
x = (-(y-109/5))/9/5
x = 5/9*(109/5-y)
x = 5/9*(109/5-y)
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