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-11.6+3a=-16.9
We move all terms to the left:
-11.6+3a-(-16.9)=0
We add all the numbers together, and all the variables
3a+5.3=0
We move all terms containing a to the left, all other terms to the right
3a=-5.3
a=-5.3/3
a=-1+2.3/3
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