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Answer:
(a) 7x²
(b) 6xyz
(c) 0
(d) 6a²+2
(e) 3x²y+7xy²
(f) 7x²-9y²
(g) 2y-3z-5t
Answer:
13x²-31x²+25x²=7x²
-2xyz-3xyz-4xyz+10xyz+5xyz=6xyz
3ab+2bc+3bc+2ab-5bc-5ab=0
2a²-3a+5a²-5a-4+3a²-2a+1=6a²+2
3x²y+7xy²
7x²-9y²
2y-3z-5t