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a+a+2+a+4+a+6+a+8+a+10=126
We move all terms to the left:
a+a+2+a+4+a+6+a+8+a+10-(126)=0
We add all the numbers together, and all the variables
6a-96=0
We move all terms containing a to the left, all other terms to the right
6a=96
a=96/6
a=16
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