`(x - 47) - 115 =0 `
`x - 47 = 0 + 115`
`x - 47 = 115`
`x = 115 +47`
`x= 162`
___________________
`315 + ( 146-2) = 401`
`x` ở đâu vậy bn ?
`(x - 47) - 115 = 0`
`x - 47 = 0 + 115`
`x - 47 = 115`
`x= 115 + 47`
`x=162`
`(x-47) - 115=0`
`=> x-47 = 0 + 115`
`=> x-47 = 115`
`=> x = 115 + 47`
`=> x = 162`
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`315 + (146 - x) = 401`
`=> 146-x = 401 - 315`
`=> 146-x = 86`
`=> x = 146 - 86`
`=> x = 60`