The first three terms of an A.P are x, (3x+1) and (7x-4). Find the 10th term

AAAaannndd the bot gets it wrong yet again!

(3x+1)-x = (7x-4)-(3x+1)
x=3, so d=7
and a10 = 3+9*7 = 66

The 10th term = (31x-29)