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10a-3=5a-9
We move all terms to the left:
10a-3-(5a-9)=0
We get rid of parentheses
10a-5a+9-3=0
We add all the numbers together, and all the variables
5a+6=0
We move all terms containing a to the left, all other terms to the right
5a=-6
a=-6/5
a=-1+1/5
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