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-0.5a-0.5=2.5
We move all terms to the left:
-0.5a-0.5-(2.5)=0
We add all the numbers together, and all the variables
-0.5a-3=0
We move all terms containing a to the left, all other terms to the right
-0.5a=3
a=3/-0.5
a=-6
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