Then the number is 3
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If I understand the question correctly it is; 2n+13 --------- n
It seems that each number is alternately one less and one more than twice the previous number.
132
Just add 13 to the number
The answer is -9 because -5 +2a = -13. -5 on both sides looks like this 2a = -18. Divide 2 on both sides because the variable has to be alone. a = -9