Book Maths Puzzle Algebra

I need help on solving linear equations with abslute value's in them the problem is 3[y+51]-15=6 []used to represent abslute value brackets. I dont need the answer I just need help

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Book Other Question

A petroleum company has two different sources for crude oil. The first source provides oil that is 60% pure, and the second one provides oil that is 85% pure. In order to obtain 80 two numbers differ by 6. The sum of the squres of the numbers is 218. find the numbers