book Maths Puzzle Numerical Ability

how do u simplify
(-y)5m8/y3m-7 if all numbers are exponents

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Hi Tutors:
I have been reading and looking up topics on various Math help sites, yet I am as lost as ever.
PROBLEM: Find the intersection point (if there is one) and graph, shad can someone please help me out as soon as possible with this problem: translate "the difference between twelve times a number and the number" into a mathematical expression. tha