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p in (-oo:+oo)
(-2/9)*(9*p+18) = 31/2 // - 31/2
(-2/9)*(9*p+18)-(31/2) = 0
(-2/9)*(9*p+18)-31/2 = 0
-2/9*(9*p+18)-31/2 = 0
(-2/9*2*(9*p+18))/2-31/2 = 0
-2/9*2*(9*p+18)-31 = 0
-4*p-39 = 0
(-4*p-39)/2 = 0
(-4*p-39)/2 = 0 // * 2
-4*p-39 = 0
-4*p-39 = 0 // + 39
-4*p = 39 // : -4
p = 39/(-4)
p = -39/4
p = -39/4
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