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x - y = 10
------------- -
2y = 30
y = 15
x + y = 40
x + 15 = 40
x = 40 - 15
x = 25
bilangan terkecilnya adalah 15.
semoga membantu ^_^
a=40-b
a-b=10 a=40-b
40-b-b=10 =40-15
-2b=10-40 =25
-2b=-30
b=15