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( x : 3 ) - 5 = 2
x : 3 = 2 + 5
x : 3 = 7
x = 3 × 7
x = 21
(a : 3) - 5 = 2
(a : 3) = 2 + 5
a : 3 = 7
a = 7 x 3
a = 21
jadi bilangan tersebut adalah 21