book Maths Puzzle Numerical Ability

Can you explain a step by step on how to solve this problem? Thanks!
-7+3p=13p-5

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book Other Question

i understood most of the graphing but i dont understand how i would get the answer for y like in the graphing of
x-y-3 or x=3y I cant figure out how to divide a monomial by a monomial. Im stuck on these three problems.
Numbers in < > represent exponents

(5n<5>p)<0> / (n<3>p)<2>=

3(a<2>b)4 / (3ab)