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UKMT Senior Mathematical Challenge, 2022

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

What is the value of $x$ in the equation $\dfrac{1+2x+3x^2}{3+2x+x^2}=3$ ?

(A) $-5$ (B) $-4$ (C) $-3$ (D) $-2$ (E) $-1$

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