Sum of 3 consecutive even no.'s is 34 more than the 1st…

Sum of 3 consecutive even no.'s is 34 more than the 1st no. of the series. Find the middle no.?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #19067