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20/28 + 7(n-7) /28 = 27/28
20/28 +7n-49 / 28 = 27/28
7n -49 / 28 = 27/28-20/28
7n-49 /28 = 7/28
7n-49 = 7
7n = 49+7
7n = 56
n = 8
Semoga membantu :D
n = ----->samakan penyebutnya
n =