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a - b = 7
--------------- dikurang
2b = 30
b = 30 / 2
= 15
a + b = 37
a + 15 = 37
a = 37 - 15
= 22
Jadi dua bilangan tersebut adalah 22 dan 15
a+b = 37
a-b = 7
2b = 30
b = 15
substitusikan
a= 22
maka 22.15 = 11.30=330