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5.7=5.2+2a
We move all terms to the left:
5.7-(5.2+2a)=0
We add all the numbers together, and all the variables
-(2a+5.2)+5.7=0
We get rid of parentheses
-2a-5.2+5.7=0
We add all the numbers together, and all the variables
-2a+0.5=0
We move all terms containing a to the left, all other terms to the right
-2a=-0.5
a=-0.5/-2
a=0.5/2
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