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2+1.66a=-4
We move all terms to the left:
2+1.66a-(-4)=0
We add all the numbers together, and all the variables
1.66a+6=0
We move all terms containing a to the left, all other terms to the right
1.66a=-6
a=-6/1.66
a=-3+1/1.6274509803922
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