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n10= 560
57= (560+ n5)15
n5 = 295
maka rata2 n5 = 59
57 = 560 + 5x/15
57.15 = 560 + 5X
855 = 560 + 5X
855-560 = 5X
295 = 5X
X = 295/5 = 59