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In order to simplify the expression
y² + 11y - 6y + y²,
we just have to add the terms with the same unkowns or combine like terms
terms with y: +11y and -6y
terms with y²: +y² and +y²
Now, we combine like terms:
terms with y: +11y - 6y = 5y
terms with y²: +y² + y² = 2y²
Then
y² + 11y - 6y + y²
= 2y² + 5y
Answer: y² + 11y - 6y + y² = 2y² + 5y