$\text { Đáp án: }$
` \frac{194-24}{\frac{12}{3}×x-3} - 25 = 145 `
` => \frac{170}{\frac{12}{3}×x-3} = 145 + 25 `
` => \frac{170}{\frac{12}{3}×x-3} = 170 `
` => \frac{170}{\frac{12}{3}×x-3} = 170/1 `
` => 12/3 × x - 3 = 1 `
` => 4 × x = 1 + 3 `
` => 4 × x = 4 `
` => x = 4 : 4 `
` => x = 1 `
$\text { Vậy }$ ` x = 1 `