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x in (-oo:+oo)
(5*p-8)/2 = x // - x
(5*p-8)/2-x = 0
(5*p-8)/2+(2*(-x))/2 = 0
5*p+2*(-x)-8 = 0
5*p-2*x-8 = 0
(5*p-2*x-8)/2 = 0
(5*p-2*x-8)/2 = 0 // * 2
5*p-2*x-8 = 0
5*p-2*x-8 = 0 // - 5*p-8
-2*x = -(5*p-8) // : -2
x = (-(5*p-8))/(-2)
x = (8-(5*p))/(-2)
x = (8-(5*p))/(-2)
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