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let the number of stamps that Simon has be x
then the number of stamps that Jimmy has be 167-x
Simon gives 4/7 of his to Trina, so he has (3/7)x left
Jimmy gives 37 to Trina, so he has 167-x - 37 or 130-x left
but now they have the same
solve : (3/7)x = 130 - x
hint: multiply both sides by 7 etc.