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-0.8a-1.9=-8.3
We move all terms to the left:
-0.8a-1.9-(-8.3)=0
We add all the numbers together, and all the variables
-0.8a+6.4=0
We move all terms containing a to the left, all other terms to the right
-0.8a=-6.4
a=-6.4/-0.8
a=+8
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