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29.1=3.6a+7.5.
We move all terms to the left:
29.1-(3.6a+7.5.)=0
We add all the numbers together, and all the variables
-(+3.6a)+29.1=0
We get rid of parentheses
-3.6a+29.1=0
We move all terms containing a to the left, all other terms to the right
-3.6a=-29.1
a=-29.1/-3.6
a=8+0.3/3.6
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