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Step-by-step explanation:
- first we will take the value of the first multiple as x
- three multiples are x, x+7, x+14
- sum = 3x+21
- so, 3x+21-7=5x
- 2x=14
- x=7
- three multiples are 7, 14, 21
the other questions answer is 54 it's quite simple
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