Answers

2016-01-11T18:18:02+08:00
X = first even number
x + 2 = second even number
x + 4 = third even number
...
x + 12 = seventh even number

x + x +2 + x + 4... + x + 12 = 42
7x + 42 = 42
 \frac{7x}{7} =  \frac{0}{7}
x = 0

0 + 2 + 4 ... + 12 = 42

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