Answer:
x=28
Explanation:
21/x = 6/8
21/x = 3/4
84=3x
3x/84
x = 28
21/ = 6/8
cross multiply: 21 x 8 = 6 x
Combine like terms: 168 = 6
Divide both sides by 6: 28 =
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= 6/8