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7/12 x a = 1/2 + 1/5
7/12 a = 5/10 + 2/10
7/12 a = 7/10
a = 7/10 : 7/12
a = 7/10 x 12/7
a = 12/10
7/12 x A = 1/2 + 1/5
7/12 x A = 5/10 + 2/10
7/12 x A = 7/10
A = 7/10 : 7/12
A = 7/10 x 12/7
A = 12/10
A = 6/5
∴ bilangan yang dimaksud adalah 6/5 atau 1 1/5