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1) 4y² - y + 8 + 8y² - y - 4 = 12y² + 4
2) 5p - 3q - r + (-p) - 2q + 3r = 4p -51 + 2r
3) x² - 3x + 8 + (-x²) + 3x = 8
Pengurangan
1) 12x + 18 - 3x - 6 = 8x + 12
2) 3p² - 3p + 3 - p² - 3p + 6 = 2p² + 9
3) y² - w - 1 - 2y - y² = -w -2y - 1
4) t- t² - 4 - t - t² = -2t² - 4