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1. 5x
sisanya kerjain yaa
10. x-7y
9. -2-7x
2. 12 ab pangkat 4
3. 4x +(-4x) = 0
4. -y -3y = -4y
5. 7 a pangkat 4
6. 18x
7. -20a
8. (3a+21a) +(-6b-7b) = 24a+-13b
9. (4-6)+(2x-9x) = -2-7x
10. (6x-5x) +(-2y-5y) = x-7y