Book Maths Puzzle Algebra

5 times the sum of three consecutive integers is 150, what are the integers?

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Book Other Question

How would you solve this equation?
2/r^2-r - 1 = 2/r-1
What does 'r' equal?
use i notation to express any nonreal complex numbers. How do I go about getting this answer? I don't understand this stuff! Thanks in advance 2x^2 + 6x + 1 = 0