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How do I write an equation to figure out four numbers that I don't know when the sum of those four numbers us 104 and includes the variable d? ​

How do I write an equation to figure out four numbers that I don't know when the sum-example-1

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D + (d+1) + (d+7) + (d+8)
D is the first day.(top left) D +1 is the next day.(top right) D +7 is the week after the first day (bottom left) d + 8 is the week after the second day (bottom right)

Simplified 4d + 16 or 4(d+4)
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User Mark Bonano
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