Direction: What should come in place of question mark (?) in the following number series?
6 x 5 -4 = 2626 x 5 + 4 =134134 x 5 - 4 =666666 x 5 + 4 = 33343334 x 5 -4 = 1666616666 x 5 + 4 = ?? = 83334
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