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0.5a-0.3=3
We move all terms to the left:
0.5a-0.3-(3)=0
We add all the numbers together, and all the variables
0.5a-3.3=0
We move all terms containing a to the left, all other terms to the right
0.5a=3.3
a=3.3/0.5
a=6+0.3/0.5
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