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14=a-3.9
We move all terms to the left:
14-(a-3.9)=0
We get rid of parentheses
-a+3.9+14=0
We add all the numbers together, and all the variables
-1a+17.9=0
We move all terms containing a to the left, all other terms to the right
-a=-17.9
a=-17.9/-1
a=17+0.9/1
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