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a-b = 23
2a = 57+23 = 80
a = 40
b = 17
ab = 40 x 17 = 680
x- y = 23
-------------- -
2y = 34
y = 17
x+y = 57
x+17 = 57
x = 40
hasil kali 2 bilangan : 40 x 17 = 680