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2.8a=17-5a
We move all terms to the left:
2.8a-(17-5a)=0
We add all the numbers together, and all the variables
2.8a-(-5a+17)=0
We get rid of parentheses
2.8a+5a-17=0
We add all the numbers together, and all the variables
7.8a-17=0
We move all terms containing a to the left, all other terms to the right
7.8a=17
a=17/7.8
a=2+1/5.5714285714286
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