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buat penyebut jdi 12 disamakan
= 4a/12 + 12a/12 - 6/12
= 16a/12 - 6/12
b) pake penyebut 8 maka
a- 2/8 + b - 1/8
= a - b - 3/8
c) pake penyebut 12 maka
= b- b + 9/12 - 2/12
= 7/12