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a - b = 38
------------- -
2b = 38
b = 19
a = 76 - 19 = 57
a : b = 57 : 19 =3
A-B=38
______ -
2B=38
B=19
A+B=76
A+19=76
A=76-19
A=57
Jadi A÷B = 57÷19=3