janelle has d dimes and n nickels.her sister has 5 times as many dimes and 6 times as many nickels as janelle has. write the sum of the number of coins they have, and then combine like terms

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Janelle has d + n coins. Sister has 5d + 6n coins. Together they have 5d + d = 6d dimes and together they have 6n + n = 7n nickels. Best wishes!