Find x and show steps if possible ; )

Alright

so the first thing you do is set up your equation

it should look something like this:

90=3x+10

next, you subtract 10 from each side resulting in 80

3x=80

divide 80 by three and you should get 26.67 or rounding either 26 or 27

then round up or down... according to the instructions

hope I could help! :)) XD