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2. 7a + 5b + 2c + 3b + c = 7a+5b+3b+2c+c = 7a + 8b + 3c
3. 4m+5m+9m = 18m
4. 6z+7m+8n+3z = 6z + 3z + 7m + 8n = 9z + 7m + 8n
5. 2k + 5k + 7j = 7k + 7j
#semoga membantu ♥ jadikan jawaban terbaik ya ♥ ♥ ♥