when doing the question 3 + 4p = -73 with lanes when I am removing 3 what do I do, subtract or add or multiply? etc.
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Remember the divisibility rule for 9. The sum of the digits of the number must be divisible by nine.
Let the digit be
. Then 
has to be divisible by nine. Recalling that 
, we note that 
.
Let the digit be