07-06-2018
Mathematics

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07-06-2018

9+x / 3x = 5/6

If you look at it as a proportion, then you can "cross-multiply" it"

(9+x) · 6 = 3x · 5

54 + 6x = 15x

Subtract 6x from each side:

54 = 9x

Divide each side by 9 :

6 = x

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