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11.0-(-2.9)=a
We move all terms to the left:
11.0-(-2.9)-(a)=0
We add all the numbers together, and all the variables
-1a+13.9=0
We move all terms containing a to the left, all other terms to the right
-a=-13.9
a=-13.9/-1
a=13+0.9/1
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