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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

The mistake this student made was in the step where they moved the x term to one side of the equation. They added x to 53x instead of subtracting x from it. The correct step should be 22 + 52x = -20 + 60x. This mistake propagated to the next steps, resulting in the incorrect solution x = 1/3.