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2.9x-2y
3.-3a+19b-2g
4.10p-7r
maaf kalo salah,maklum saya juga manusia!
= 15a - 8a + a - 10b - 12b
= 6a -22b
2. 12x +5y-3x-7y
= 12x-3x+5y -7y
=9x -2y
3. 10a+2b- -13a+4b-2g+13b
= 10a +13a+2b+4b+13b-2g
= 23a+19b-2g
4. (15p-13q-10r)-(-5p)+13q-7r)
= 15p-13q-10r+5p+13q+7r
= 15p +5p-13q+13q-10r+7r
=20p-3r