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exSPiDERmate

Answer: -7

Step-by-step explanation:

Let n be "an integer" then the next consecutive integer is (n + 1)

So twice the smaller is 2n and 9 more than that is 2n + 9 so:

2n + 9 = n + 1

n + 9 = 1

n = -8

The next consecutive number is -7