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28=a/0.8
We move all terms to the left:
28-(a/0.8)=0
We add all the numbers together, and all the variables
-(+a/0.8)+28=0
We get rid of parentheses
-a/0.8+28=0
We multiply all the terms by the denominator
-a+28*0.8=0
We add all the numbers together, and all the variables
-1a+22.4=0
We move all terms containing a to the left, all other terms to the right
-a=-22.4
a=-22.4/-1
a=22+0.4/1
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