You can put this solution on YOUR website! If you are looking for two consecutive integers, you can say the smaller one is x and the larger one is x + 1.
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Twice the smaller one would be 2x, and 15 more than that would be 2x + 15, so:
: , is the smaller integer and is the larger one.
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Check: Twice the smaller integer (-14) is -28, 15 more than that is -28 + 15 = -13. Check.