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= 10x + 2x + 3
= 12x + 3
2. 7a - 5b + 10a + 15b
= 7a + 10a + 15b - 5b
= 17a + 10b
3. 16q - 5t + 6q + 8t
= 16q + 6q + 8t - 5t
= 22q + 3t
4. xy - 3xy + 6y - 8y + 3
= - 2xy -3y + 3
5. (5p - 7q + 5 ) - ( 3p + 8q -10 )
= 5p - 3p - 7q + 8q + 5 - 10
= 2p - q - 5
maaf kalau ada yang salah.