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Verified answer
24 cmMaaf kalau salah
f = 6 cm
M = 4 kali
s = __?
M = f / (s - f)
4 = 6 / s - 6
4 ( s - 6 ) = 6
4s - 24 = 6
4s = 30
s = 30 / 4
s = 7,5 cm