There are an infinite number of equations that would yield a result of 840.
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Multiples of the numbers 12 and 28 are 84, 168, 252, 336, 420, 504, 588, 672, 756 and 840.
12, 24, 36, 48, 60, 72, 84, 96, 108, . . . 35, 70, 105, 140, 175, 210, 245, 280, 315, . . .
For all natural numbers ( the counting numbers, 1,2,3,4, are natural numbers), 840 times each of those is a multiple of 840. We say let k be the natural numbers 1,2,3... where ... means it goes on forever. So we have 840k are all the multiples Here is a list of a few. 840 x 1 = 840 840 x 2 = 1680 840 x 3 = 2520 840 x 4 = 3360 we continue with 840x5, 840x6, etc.
The total number of integers that are multiples of both 42 and 56 is infinite. Here are the first few: 168, 336, 504, 672, 840 . . .
Here are some multiples of both 15 and 7: 105, 210, 315, 420, 525, 630, 735, 840, 945.