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(2*x)/9-(1/p) = 2*x-(1/9) // - 2*x-(1/9)
(2*x)/9-(1/p)-(2*x)+1/9 = 0
(2*x)/9-p^-1-2*x+1/9 = 0
1/9-p^-1-16/9*x = 0 // - 1/9-p^-1
-16/9*x = -(1/9-p^-1) // : -16/9
x = (-(1/9-p^-1))/(-16/9)
x = -9/16*(p^-1-1/9)
x = -9/16*(p^-1-1/9)
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