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( 13a - 18b) + ( 12a +9)
= 13a - 18b + 12a + 9
= 25a -18b + 9
jawaban soal nomer 2
(15i + 14b +13k) + ( -30i -45j + 51k)
= 15i + 14b +13k -30i -45j + 51k
= -15i + 14b + 64k -45j
jawaban soal nomer 3
(3-17x + 35z) + ( 4x + 23y -9)
= 3-17x + 35z + 4x + 23y -9
= - 13x +23y +35z - 6