book Maths Puzzle Numerical Ability

what is the answer to 7-y+5y=9

what is the answer to -37=3x+11-7x

what is the answer to 1/6(y+42)-15=-3

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I have one more (18x^5y^2/6x^2y^-4)^-1. I am hoping with the explantion I will be able to understand more. Thank you for your help.. A dentisit can schedule 15 patients in a day if she allows 24 minutes per patient. How many can she schedule if she allows 30 minutes per patient and works the same number of hours?