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Find least non negative integer r such t...

Find least non negative integer r such that `6xx18xx27xx(-225) -= r "(mod 8)"`

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`6xx18xx27xx -225 -= r("mod8")`
`"Now" 6xx18=108 -=4 "mod"8`
`27 -= 3 "mod" 8`
`-225-=7 "mod" 8`
`implies6xx18xx27xx-225 -= 4xx3xx7 "mod"8`
`-=84 "mod"8
-= 4 "mod" 8`
`:. r=4`
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