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-2.7-a=-6.4
We move all terms to the left:
-2.7-a-(-6.4)=0
We add all the numbers together, and all the variables
-1a+3.7=0
We move all terms containing a to the left, all other terms to the right
-a=-3.7
a=-3.7/-1
a=3+0.7/1
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