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16-2a=5a-9
We move all terms to the left:
16-2a-(5a-9)=0
We get rid of parentheses
-2a-5a+9+16=0
We add all the numbers together, and all the variables
-7a+25=0
We move all terms containing a to the left, all other terms to the right
-7a=-25
a=-25/-7
a=3+4/7
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