On row 1, E is the wrong one because it should be 9n but its 8n instead
On row 2, P is the wrong one because it should be 6x but its 6+3x instead
On row 3, N is the wrong one because it should be 2x+2 but its 3x instead
On row 4, R is the wrong on because it should be 11a+3 but its 14a instead
On row 5, R is the wrong one because it should be 18n but its 9n instead
On row 6, M is the wrong one because it should be 15x+3 but its 15x+45 instead
On row 7, A is the wrong one because it should be 14t+4 but its 18t instead
On row 8, E is the wrong one because it should be 3n+21 but its 9+7n
