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10x² - 4x² + 6xy - 2xy -12 + 10
6 x² + 4xy - 2
b. 4p²- 10p - 5 - 8p² + 10p+ 15
kalau 'dari' misal kurangi a dari b maka b- a, bukan a- b
4p²- 8p² - 10p+ 10p -5 + 15
-4p²+ 10