The idea is to simplify, simplify, simplify!
3s=4(s-6)+2
distribute the 4:
3s=4s-24+2
combine the numbers:
3s=4s-22
subtract 4s from both sides, so that you have all “s”‘s on one side of the equation and all numbers on the other side:
-1s= -22
divide by -1 (on both sides of the equation) so that you have “s” on its own, resulting in s=something
s=22
=======================
Check:
3s=4(s-6)+2
3(22) = 4(22-6)+2
66 = 4(16) +2
66 = 64 +2
66 = 66