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19=a-5.9
We move all terms to the left:
19-(a-5.9)=0
We get rid of parentheses
-a+5.9+19=0
We add all the numbers together, and all the variables
-1a+24.9=0
We move all terms containing a to the left, all other terms to the right
-a=-24.9
a=-24.9/-1
a=24+0.9/1
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