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\[600 + 60x + 40x + 4x^2 = 792\]Simplify to:\[4x^2 + 100x + 600 = 792\]Subtract 792 from both sides:\[4x^2 + 100x - 192 = 0\]Divide the entire equation by 4:\[x^2 + 25x - 48 = 0\]Use the quadratic formula:\[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]Where \( a = 1 \), \( b = 25 \), \( c = -48 \).