add 6m+7n-4p+11, 17m-5n+8p and 8p +7-5n
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6m+7n-4p+11+17m-5n+8p+8p+7-5n
Bringing like terms together
6m+17m+7n-5n-5n-4p+8p+8p+11+7
23m-3n+12p+18
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