Expressed algebraically, this is equal to 3x + 7.
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3 times more than a number, since n is unknown. In other words, 3n
7
3
If a number is more than 1, then three of it must be more than 3.(If I give you more than a dollar three times, you certainly wind up with more than $3.)
if D is the number of dogs then5D is five times the number of dogs,and 5D + 3 is three more than five times the number of dogs