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ek + fj + (-1) fj = (-1) (fj) + ac
ek = (-1) (fj) + ac
ek = (-1)fj + ac
ek = ac + (-1) fj
ek = ac - fj
ek /e = ac - fj /e
k = ac - fj /e
k = - fj - ac /e
hasilnya adalah k sama dengan minus, fj min ac per e