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0.6666666667+0.6666666667+0.6666666667=a
We move all terms to the left:
0.6666666667+0.6666666667+0.6666666667-(a)=0
We add all the numbers together, and all the variables
-1a+2.0000000001=0
We move all terms containing a to the left, all other terms to the right
-a=-2.0000000001
a=-2.0000000001/-1
a=2+1.00000008274E-10/1
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