CEMC Pascal, 2006

Algebra Difficulty 1.0 Junior Find the answer Canada

The lengths of the three sides of a triangle are $7$ , $x+4$ and $2x+1$ . The perimeter of the triangle is $36$ . What is the length of the longest side of the triangle?

(A) $7$ (B) $12$ (C) $17$ (D) $15$ (E) $16$

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