What mistake did this student make? Be specific

Question

What mistake did this student make? Be specific

(Try solving it and compare what you got vs the sample below. It's ok if their steps are slightly different than yours but one of these steps is wrong)
22 + 53x + x = -20 + 60x
22 + 54x = -20 + 60x
22=-20 + 6X
2 = 6x
x = 1/3

Answer 1

The mistake the student made was when they subtracted 53x from both sides in the first step. This resulted in the following incorrect step: 22 + 54x = -20 + 60x. The correct step should be 22 + x = -20 + 60x.