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a+b = 40,
a-b = 10
------------ + [ditambah]
2a = 50 , a = 25, maka b = 40 - 25 = 15
maka axb = 25x15 = 375
- = 10
---------------------------------------------- +
2 = 50
= 25
+ = 40
25 + = 40
= 15
x = x
25 x 15 = 375