Tyrone wrote an equivalent expression for 28 + x - 2n + 7 - n - 5x + 4. His equivalent expression was - 3n - 5x + 39 + x. What error did Tyrone make?
A. Tyrone neglected to combine the x terms.
B. Tyrone added the constants instead of subtracting them.
C. Tyrone neglected to add the coefficients of the n terms.
D. Tyrone made an error when he added the constants.
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