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a + b = 42
----------------- dikurang
-2b = -30
b = 15
a - b = 12
a - 15 = 12
a = 27
a+b=42⇒(12+b)+b=42⇒12+2b=42⇒2b=30⇒b=15
a-b=12⇒a-15=12⇒a=27