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2.5+3a=11.8
We move all terms to the left:
2.5+3a-(11.8)=0
We add all the numbers together, and all the variables
3a-9.3=0
We move all terms containing a to the left, all other terms to the right
3a=9.3
a=9.3/3
a=3+0.3/3
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