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1n = 4/10
1n = 0,4
5n+25n-15n= 5(0,4) + 25(0,4) - 15(0,4)
= 2 + 10 - 6 = 6cm
karena 10n melambangkan 4cm, maka 15n berarti => x 4 = 6 cm
jadi resultan gaya tersebut akan memiliki panjang 6 cm