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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/p+3/8-(2/5) = 7 // - 7
9/p+3/8-(2/5)-7 = 0
9/p+3/8-2/5-7 = 0
9*p^-1 = 281/40 // : 9
p^-1 = 281/360
-1 < 0
1/(p^1) = 281/360 // * p^1
1 = 281/360*p^1 // : 281/360
360/281 = p^1
p = 360/281
p = 360/281
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