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16=2.5a
We move all terms to the left:
16-(2.5a)=0
We add all the numbers together, and all the variables
-(+2.5a)+16=0
We get rid of parentheses
-2.5a+16=0
We move all terms containing a to the left, all other terms to the right
-2.5a=-16
a=-16/-2.5
a=6+1/2.5
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