An ant crawls on the number axis. First it crawls four length units to the left, then it crawls three length units to the right. The number of the end point is 1. Then what is the number of the starting point of the ant?) urgent! Before 11 o'clock!

Think in reverse
If the end point is 1, then it is 1 before crawling and 3 units to the left, then it is - 2 before crawling
-2 is obtained by crawling four length units to the left, and then four length units to the right, so the original number is 2

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