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3a²-5ab+3-(-5ab)-a²+5=3a²-1a²-5ab+5ab+3+5
= 2a²+8
3p³ +8 -x³ +7x
2. 3a² -5ab +3 -(-5ab -a² +5)
3a² -5ab +3 +5ab +a² -5
3a² +a² -5ab +5ab +3 -5
4a² -2