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50=28.1+0.51a
We move all terms to the left:
50-(28.1+0.51a)=0
We add all the numbers together, and all the variables
-(0.51a+28.1)+50=0
We get rid of parentheses
-0.51a-28.1+50=0
We add all the numbers together, and all the variables
-0.51a+21.9=0
We move all terms containing a to the left, all other terms to the right
-0.51a=-21.9
a=-21.9/-0.51
a=42+0.48/0.51
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