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2a=(-9.3)=0.8a+5.1
We move all terms to the left:
2a-((-9.3))=0
We add all the numbers together, and all the variables
2a+9.3=0
We move all terms containing a to the left, all other terms to the right
2a=-9.3
a=-9.3/2
a=-4+1/1.53846153846
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