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Answer: B
Add 7 to both sides: 3x = 18. Divide both sides by 3: x = 6. Check: 3(6) − 7 = 11 ✓
Trap A Incomplete inverse operations: Undo operations in REVERSE order, one at a time, to the whole of each side. Make a list: what was done to x? Undo the last one first. Check by substituting back.
Trap C Incomplete inverse operations: Undo operations in REVERSE order, one at a time, to the whole of each side. Make a list: what was done to x? Undo the last one first. Check by substituting back.
Trap D Sign slip when moving or multiplying terms: Moving a term across "=" means doing the opposite operation to BOTH sides. And (−)×(−) = (+). Write each step on a new line; circle every minus sign before you expand.