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Find least positive integer x, satisfyin...

Find least positive integer x, satisfying
`276x+128=4` (mod 7).

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Now 128 -= mod 7
Now `176 x+128 -=4 "mod" 7`
`implies 176x -=(4-2)"mod" 7`
`implies 176 x -=2 "mod" 7`
`176 xx x=2 "mod" 7`,
` "But" 276 -= 3 "mod" 7,`
`"Thus" x=3`.
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