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diketahui

N(s) = 50

N(a) = 15 –X

N(b) = 27 +X

N(s) = N(a) + X + N(b)

50 = 15–X +X+27 +X

50 = 15+27+X

X = 50–42

X = 8

notes : melezz pake akun pertama yg kedua aja