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2. -b
3. -5x+8y-3
4. 2a-b+3
= 2x - 3 - 4x - 5
= 2x - 4x - 3 - 5
= -2x - 8
2. (3a + 4b) - (-3a - 5b)
= 3a + 4b + 3a + 5b
= 3a + 3a + 4b + 5b
= 6a + 9b
3. (2x - 5y - 3) - (7x - 3y)
= 2x - 5y - 3 - 7x + 3y
= 2x - 7x - 5y + 3y - 3
= -5x - 2y - 3
4. (5a + 3b - 2) - (-3a - 4b + 5)
= 5a + 3b - 2 + 3a + 4b - 5
= 5a + 3a + 3b + 4b - 2 - 5
= 8a + 7b - 7
Selesai