165
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If x - (-15) = 11 then x = -4.
11 x 15 is 165.
(Ï€ x 11) x 15
If you mean 6(x-11) = 15-4x then 6x-66 = 15-4x and the value of x works out as 8.1
5 and 11 are prime. The others are not (3 x 4 =12, 3 x 5 =15, 2 x 11 =22)