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p in (-oo:+oo)
(-2/5)*(5*p-16) = 10 // - 10
(-2/5)*(5*p-16)-10 = 0
-2/5*(5*p-16)-10 = 0
-2/5*(5*p-16)-10 = 0
-2*p-18/5 = 0
-2*p-18/5 = 0
-2*p-18/5 = 0 // + 18/5
-2*p = 18/5 // : -2
p = 18/5/(-2)
p = -9/5
p = -9/5
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