Question 15In which expression can every $6$ be replaced by another integer while preserving the result?$\left(6 + 6\right) \div 6 + 6$$6 \times \left(6 + 6\right) \div 6$$6 + 6 - 6 + 6$$\left(6 + 6 - 6\right) \times 6$$\left(6 + 6 - 6\right) \div 6$