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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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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.