book Maths Puzzle Numerical Ability

four married couples enter a restaurant. How many ways can they be seated at a round table so that the men and women alternate and no husband and wife sit next to each other? (the

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wonder if i am at the right place if not please direct me tell me is this correct please (-12)+5-(-7)=-12+5+7=1-12+12=0 this is what my teacher say i cant make out how it goes thank you. In this problem it says to simplify. Can I see a step by step on how to do that?

5x to 12th y square/10xy9