If ‘+’ = ‘÷’, ‘-’ = ‘×’, ‘×’ = ‘+’, ‘÷’ = ‘-’, which equation is incorrect?

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1. Replace symbols: '+' = ÷, '-' = ×, '×' = +, '÷' = -.

2. For (a): $12 + 4 - 2$ becomes $12 \div 4 	imes 2 = (12 \div 4) 	imes 2 = 3 	imes 2 = 6$.

3. Right side is $5$. So $6 
e 5$. Thus (a) is wrong.

4. Quick checks: (b) $10 	imes 3 \div 5 	o 10+3-5=8$, (c) $8 \div 4 + 2 	o 8-4\div2=6$, (d) $6-2	imes3 	o 6	imes2+3=15$.

FINAL_ANSWER: a

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