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x in (-oo:+oo)
n = (5*x-p)/(-5) // - (5*x-p)/(-5)
n-((5*x-p)/(-5)) = 0
(-1*(5*x-p))/(-5)+n = 0
(-1*(5*x-p))/(-5)+(-5*n)/(-5) = 0
-1*(5*x-p)-5*n = 0
p-5*n-5*x = 0
(p-5*n-5*x)/(-5) = 0
(p-5*n-5*x)/(-5) = 0 // * -5
p-5*n-5*x = 0
p-5*n-5*x = 0 // - p-5*n
-5*x = -(p-5*n) // : -5
x = (-(p-5*n))/(-5)
x = (p-5*n)/5
x = (p-5*n)/5
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