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Find a6 for an arithmetic sequence where a1=3x+1 and d=2x+6 . I can't even solve it because I do not have any idea.

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in an arithmetic sequence
term(n) = a + (n-1)d
inyour case a = 3x+1
d = 2x+6

term(6) = a + 5d
= 3x+1 + 5(2x+6)
= 3x+1 + 10x + 30
= 13x + 31

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