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.2.25.25a+.18(12-a)=12
We move all terms to the left:
.2.25.25a+.18(12-a)-(12)=0
We add all the numbers together, and all the variables
.2.25.25a+.18(-1a+12)-12=0
We add all the numbers together, and all the variables
0.0125a+.18(-1a+12)-12=0
We multiply parentheses
0.0125a-0.18a+2.16-12=0
We add all the numbers together, and all the variables
-0.1675a-9.84=0
We move all terms containing a to the left, all other terms to the right
-0.1675a=9.84
a=9.84/-0.1675
a=-58+0.125/0.1675
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