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If the numbers are n, (n+2) and (n+4), then your equation is
(n+2) + 2*(n+4) = 4n.
Simplify and solve for n
n+2 + 2n + 8 = 4n
2 + 8 = 4n - n - 2n
10 = n
ANSWER. The numbers are 10, 12 and 14; the largest is 14.