Answer :

numbers are 26 and 30
{ x + y = 56
{ y = x + 4

x + y = 56
x + ( x + 4 ) = 56
x + x = 56 - 4
2x = 52
x = 52
       2
x = 26

x + y =56
26 + y = 56
y = 56 - 26
y = 30

S = { 26 , 30 }

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