You are given an N x 5 matrix where each row represents a mathematical relationship between five variables: **a,
…
Given an array of values, determine the required result under the following conditions.
Input: [4, 8, 15, 16, 23, 42]
Output: 3
Constraints: 1 ≤ n ≤ 10⁵
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=> 10 = 2 * d => d = 5.
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