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-0.932=-2.8+a/8.3
We move all terms to the left:
-0.932-(-2.8+a/8.3)=0
We add all the numbers together, and all the variables
-(a/8.3-2.8)-0.932=0
We get rid of parentheses
-a/8.3+2.8-0.932=0
We multiply all the terms by the denominator
-a+(2.8)*8.3-(0.932)*8.3=0
We add all the numbers together, and all the variables
-1a+15.5044=0
We move all terms containing a to the left, all other terms to the right
-a=-15.5044
a=-15.5044/-1
a=15+0.5044/1
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