17 x \(x\) + 15 x ( \(x\) x 3) + 12 x ( 15 - \(x\) x 4) = 680
17 x \(x\) + 45 x \(x\) + 12 x 15 - 12 x 4 x \(x\) = 680
17 x \(x\) + 45 x \(x\) + 180 - 48 x \(x\) = 680
\(x\) x ( 17 + 45 - 48) + 180 = 680
\(x\) x 14 = 680 - 180
\(x\) x 14 = 500
\(x\) = 500: 14
\(x\) = 250/7
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\(17\times x+15\times\left(x\times3\right)+12\times\left(15-x\times4\right)=680\)
\(17\times x+45\times x+180-48\times x=680\)
\(x\times\left(17+45-48\right)+180=680\)
\(x\times14=500\)
\(x=\dfrac{500}{14}\)
\(x=\dfrac{250}{7}\)
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