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⇒ 12/(12 + x) = 4/5
⇒ (12 + x)(4) = (12)(5)
⇒ 4x + 48 = 60
⇒ 4x = 12
⇒ x = 3
jawab : c
8(12 +x ) = 120
96 + 8x = 120
120 - 96 = 8x
24/8 = x
3 = x