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-2.5a+3.8=4.6
We move all terms to the left:
-2.5a+3.8-(4.6)=0
We add all the numbers together, and all the variables
-2.5a-0.8=0
We move all terms containing a to the left, all other terms to the right
-2.5a=0.8
a=0.8/-2.5
a=-0.8/2.5
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