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7p³ -3 -(3p³ +8)
7p³ -3 -3p³ -8
7p³ -3p³ -3 -8
4p³ -11
2. Dibalik dahulu, maka
-4ab +a² -7 -(7a² -4ab -2)
-4ab +a² -7 -7a² +4ab +2
-4ab +4ab +a² -7a² -7 +2
-6a² -5