[(123x-456)]+25=1256
=>123x-456=1231
=>123x=1687
=>x=1687/123
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\(\left[\left(123x-456\right)\right]+25=1256\)
\(123x-456=1231\)
\(123x=1231+456\)
\(123x=1687\)
\(x=1687:123\)
\(x=13\frac{88}{123}\)
Vậy \(x=13\frac{88}{123}\)
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