# Lack O' Info III

Algebra Level 3

$\left ( \dfrac{a+\sqrt{b}}{c} \right )^2 = \dfrac{a+\frac{b}{c}\sqrt{b}}{c} .$

Consider three non-zero integers $$a,b,c$$ such that $$b$$ is square-free and they satisfy the equation above.

Evaluate $$2c-b$$.

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