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The tird term of an arithmetic sequence is -12 and the seventh term is 8. What is the sum of the first 10 terms/

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JustinJakeAshtonviz
This is the possible answer:
(x+5)
1st  = -22
2nd = -17
3rd = -12
4th = -7
5th = -2
6th = 3
7th = 8
8th = 13
9th = 18 and
10th = 23
-22 - 17 - 12 - 7 - 2 + 3 + 8 + 13 + 18 + 23 = 5