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9-3a=7a-1
We move all terms to the left:
9-3a-(7a-1)=0
We get rid of parentheses
-3a-7a+1+9=0
We add all the numbers together, and all the variables
-10a+10=0
We move all terms containing a to the left, all other terms to the right
-10a=-10
a=-10/-10
a=1
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