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bilangan kedua = a2
a1 + a2 = 100
a1 - a2= 40 -
2a2 = 60
a2 = 30
cari a1, subtitusikan a2
a1 + a2 = 100
a1 + 30 = 100
a1 = 100-30
a1= 70
maka a1 = 70
maka a2 = 30