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= 6x + 5 + ( -3x - 6)
= 6x + 5 - 3x - 6
= 3x - 1
soal B
= 6x - 5y + (-8x + 6y + 9z)
= 6x - 5y - 8x + 6y + 9z
= -2x + y + 9z
soal C
= 3(2x² - 4x + 5) + 2(4x² + 3x - 7)
= 6x² - 12x + 15 + 8x² + 6x - 14
= 14x² - 6x + 1