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-2p(5p^ - 3pq)=
-10p pangkat 3 + 6p^q
(3a + 7)(a - 3) =
3a^- 9a + 7a - 21 =
3a^ - 2a - 21
(4x + 5y)(4x - 5y) =
16x^ - 20xy + 20xy - 25y^ =
16x^ - 25y^