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9.3=a-2.5
We move all terms to the left:
9.3-(a-2.5)=0
We get rid of parentheses
-a+2.5+9.3=0
We add all the numbers together, and all the variables
-1a+11.8=0
We move all terms containing a to the left, all other terms to the right
-a=-11.8
a=-11.8/-1
a=11+0.8/1
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