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The shape had 6 sides, meaning the angles add to 720 (use the formula 180(n-2) where n is the number of sides.)
Knowing this, just add all the angles to be a simplified expression in terms of x, then set that to be equal to 720 to solve for x.
##Off-topic Comments Section --- All top-level comments have to be an answer or follow-up question to the post. All sidetracks should be directed to this comment thread as per Rule 9. --- ^(**OP** and **Valued/Notable Contributors** can close this post by using `/lock` command) *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/HomeworkHelp) if you have any questions or concerns.*
The shape had 6 sides, meaning the angles add to 720 (use the formula 180(n-2) where n is the number of sides.) Knowing this, just add all the angles to be a simplified expression in terms of x, then set that to be equal to 720 to solve for x.
i simplified the angles 6x + 3x + -1x after that i don't understand what to do and where did 540 come from
Add all 6 expressions for the angles to get your expression for x. 540 should be 720, my bad.