Question 198998
Let x = Quotient  of  above
.
Then 5x+4 = 4n-1,,,,,  that  is  quotient  times divisor is  4 less  than  dividend,,,hence  remainder  4
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 5x +5 =4n
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(5x+5) / 4 =n
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itterate  x  until  n = integer
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@ x=7,,,n=10
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check
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( 4*10 -1) / 5 = 39/5 = 7 rem4