Answer :

AL2006
(12 + x)/3 = 5

Multiply each side by 3 :

12 + x = 15

Subtract 12 from each side:

x = 3
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x/3 - 5 = 3

Multiply each side by 3 :

x - 15 = 9

Add 15 to each side:

x = 24

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