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⇒8x² + 6x² + 4x - 14x + (-21) + 7
⇒ 14x² + (-10x) + -14
2. 7a + 14 dari 9a + 12
⇒9a +7a +14 +12
⇒ 16a + 26
3. 2x² - 15x - 18 dari 11x² - 17x + 24
⇒11x² + 2x² + (-17) -15x + 24 - 18
⇒ 13x² + (-2) + 6
maaf klo salah, nomor 4 gak tau saya!!