Book Maths Puzzle Age Problem

Hello,
My name is Taylor Ferguson. I am 12 years old in 7th grade. we are learning solving equations but i quit dont know the point of it still. if you could help me that would

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Book Other Question

A shepard has some sheep. He buys 3 more sheep. Now he has 7 times as many sheep than if he had sold 3 sheep instead of buying 3 sheep. How many sheep does he have now? (x squared+4x-12) divded by (x-2)?

Iam sorry my computer does not have divide and Iam not sure how to write x squared with the number 2.