Free ACT Practice Question

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ID: ACT-M-42
Section: Math
Topics: Functions; Functions
Difficulty level: Medium

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An operation $@$ is defined by the equation $a\,@\,b = \dfrac{a + b}{a - b}$, for all numbers $a$ and $b$ such that $a \neq b$. If $a\,@\,c = 2$, then what is the value of $c$ in terms of $a$?

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