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a). x + 4y - 15 dari 3x - y + 4
= (3x - y + 4) - (x + 4y - 15)
= 3x - y + 4 - x - 4y + 15
= 3x - x - y - 4y + 4 + 15
= 2x - 5y + 19
b). 3a - b dari 2a + 12b - 9
= (2a + 12b - 9) - (3a - b)
= 2a + 12b - 9 - 3a + b
= 2a - 3a + 12b + b - 9
= –a + 13b - 9
c). 5p - 3q + 2 dari 4p - 4q + 3
= (4p - 4q + 3) - (5p - 3q + 2)
= 4p - 4q + 3 - 5p + 3q - 2
= 4p - 5p - 4q + 3q + 3 - 2
= 9p - q + 1