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= 6/21 - 7/21 × 1/2
= -1/21 × 1/2
= -1/42
gtw bener apa nggk. kalo salah maaf ya
selesaikan perkalian dulu
2/7-(1/3x1/2)=
2/7-(1/6)= disamakan penyebutnya menjadi 42
12/42-7/42=5/42