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13=3.6+a
We move all terms to the left:
13-(3.6+a)=0
We add all the numbers together, and all the variables
-(a+3.6)+13=0
We get rid of parentheses
-a-3.6+13=0
We add all the numbers together, and all the variables
-1a+9.4=0
We move all terms containing a to the left, all other terms to the right
-a=-9.4
a=-9.4/-1
a=9+0.4/1
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