Book Maths Puzzle Algebra

Solve y^2 + 6y + 9 = 49

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Book Other Question

Solve x+4 = -4/x
How do I solve mixture problems for example:
A 50-gallon barrel of milk is 6% butterfat. How much skim milk (no butterfat) should be mixed to make that is 3% butterfat? using a graph