...(52-x) =Number of nickels. You can then say that: (x*1) + (52-x)(5) = 120 x + 260 - 5x = 120 260 - 4x = 120 260 - 4x + 4x = 120 + 4x 260 = 120 + 4x 260 - 120 = 120 + 4x - 120 140 = 4x 35 = x =
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