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2. 4x + 4y+ 3p+ 3q (tdk bsa di jumlahkan karena beda variabel)
3. 2p - 2q + 3p + 3q = 5p + q
4. 7t + 7 + 5t -3 = 12t +4
5. 3a + 5 + a + 7 = 4a + 12
6. x^2 + 5 + x^2 -6 = 2x^2 - 1
7. 3p + 4q + p + 2q = 4p + 6q
8. a + b + 3 - a + b -1 = 2b + 2
9. 3x + 4 + 3x + 8 = 6x + 12
10. 2p + 5 + 10p -1 = 12p + 4
11. x^2 - 7 + 2x^2 + 1 = 3x^2 - 6
12. 5a^2 + 1 + 4a^2 +1 = 9a^2 + 2