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=1/30-1/45
=3/90-2/90=1/90
Si=90cm
maaf kalo salah
so = 45
ho = 6
si?
1/f = 1/so + 1/si
-1/si = 1/so - 1/f
-1/si = 1/45 - 1/30
-1/si = 2/90 - 3/90
-1/si = -1/90
si = 90
maaf jika salah