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-3a+2.4=4.5
We move all terms to the left:
-3a+2.4-(4.5)=0
We add all the numbers together, and all the variables
-3a-2.1=0
We move all terms containing a to the left, all other terms to the right
-3a=2.1
a=2.1/-3
a=-2.1/3
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