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0.1a+0.9(25-a)=16.1
We move all terms to the left:
0.1a+0.9(25-a)-(16.1)=0
We add all the numbers together, and all the variables
0.1a+0.9(-1a+25)-(16.1)=0
We add all the numbers together, and all the variables
0.1a+0.9(-1a+25)-16.1=0
We multiply parentheses
0.1a-0.9a+22.5-16.1=0
We add all the numbers together, and all the variables
-0.8a+6.4=0
We move all terms containing a to the left, all other terms to the right
-0.8a=-6.4
a=-6.4/-0.8
a=+8
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