c) \( \frac{2 \cdot(5-1)}{x}=\frac{2 \cdot x}{3^{2}+2(-4)} \)
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Let's start by simplifying and solving the equation step by step. First, simplify the right side: \[ 3^2 + 2(-4) = 9 - 8 = 1 \] Now substituting back into the equation gives us: \[ \frac{2 \cdot (5-1)}{x} = \frac{2 \cdot x}{1} \] This simplifies to: \[ \frac{2 \cdot 4}{x} = 2x \] Next, we can write the equation as: \[ \frac{8}{x} = 2x \] Cross-multiplying leads to: \[ 8 = 2x^2 \] Dividing both sides by 2: \[ 4 = x^2 \] Taking the square root of both sides yields: \[ x = 2 \quad \text{or} \quad x = -2 \] So the solutions to the equation are \( x = 2 \) and \( x = -2 \).