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2.3a+8.6=-13.8
We move all terms to the left:
2.3a+8.6-(-13.8)=0
We add all the numbers together, and all the variables
2.3a+22.4=0
We move all terms containing a to the left, all other terms to the right
2.3a=-22.4
a=-22.4/2.3
a=-9+1/1.3529411764706
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