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15 = x + 10
x = 5
9/6 = 10 + x / 10 ( lalu di kali silang)
9 . 10 = 6 ( 10 + x )
90 = 60 + 6x
90 - 60 = 6x
30 = 6x
x = 30 / 6
x = 5 cm
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Semoga membantu ya! ;)