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0.5a-1.2=0.3a+0.8
We move all terms to the left:
0.5a-1.2-(0.3a+0.8)=0
We get rid of parentheses
0.5a-0.3a-0.8-1.2=0
We add all the numbers together, and all the variables
0.2a-2=0
We move all terms containing a to the left, all other terms to the right
0.2a=2
a=2/0.2
a=10
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