Solve the 90 term of an a AP whose 9 term and 22 term are 29 and 55

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Solve the 90 term of an AP Whose 9 term and 22 term are 29 and 55
impatient much? Reposting after 7 whole minutes?
the common difference is d = (55-29)/(22-9) = ___
a_90 = a_22 + 78d