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2. 9 - 8 + 7 - 5 =
+ 2
3. 7a + 7ab - 3b - 3ab = 7a + 4ab - 3b
Semoga membantu. Kebetulan soalnya sama, hehe!
2. 9xpangkat2 - 8xpangkat2 + 7xpangkat3 - 5xpangkat3 = xpangkat2 + 2xpangkat3