Determine the 100th term of the arithmetic sequence with t7 465 and t13 219

i need help on this question. can someone do this step by step for me thx

t13 = t7 + (13 - 7)d

219 = 465 + (6)d

-246 = 6d

d = -41


now...

t100 = t7 (100 - 7) -41

t100 = 465 + (100 - 7)-41

t100 = 465 + (93)-41

t 100 = -3348