So
a be first term and d be common difference
- a+a+2d+a+4d+a+6d+a+9d=17
- 5a+21d=17--(1)
And
- a+d+a+3d+a+5d+a+7d+a+9d=15
- 5a+25d=15--(2)
Eq(1)-Eq(2)
Put in second one
- 5a+25d=15
- a+5d=3
- a+5/2=15
- a=15-5/2
- a=25/2
A number divided by 7 is 9:

Multiply both sides by 7 to get the answer so it'll be:
x = 63
Answer:
Step-by-step explanation was 34
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Step-by-step explanation:
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