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Karna (SR • KP ) + ( SK • PQ ) ÷ (SK + KP ) sama dengan KL. Maka..
(8 • x ) + ( 6 • 18 ) ÷ (6+x) = 12
= 8x + 108 ÷ (6+x) = 12
=8x + 108 = 12(6+x)
= 8x + 108 = 72 + 12x
= 108 - 72 = 12x - 8x
= 36 = 4x
x = 36 ÷ 4
x = 9