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CARA:
pertama-tama di samakan dlu
= 13a + 12a + 8b + 9b
setelah sudah di sama kan,jadi baru ada hasilnya,jadi hasilnya
= 25a + b
jadi biar lebih jelas
( 13a - 8b ) + ( 12a + 9b )
= 13a + 12a + 8b 9b
= 25a + b
semoga membantu