Penjelasan:
fr=f1-f2=10n-15n=5n
fr=f1-f2=20n-25n=5n
5n+5n=10n ke kanan
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Penjelasan:
fr=f1-f2=10n-15n=5n
fr=f1-f2=20n-25n=5n
5n+5n=10n ke kanan