6 / 9 = 8 / x Multiply both sides by x
6 * x / 9 = x * 8 / x
6 x / 9 = 8 Multiply both sides by 9
6 x * 9 / 9 = 8 * 9
6 x = 72 Divide both sides by 6
6 x / 6 = 72 / 6
x = 12
6 : 9 = 8 : 12
6:9=8:___
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