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9=4a+17
We move all terms to the left:
9-(4a+17)=0
We get rid of parentheses
-4a-17+9=0
We add all the numbers together, and all the variables
-4a-8=0
We move all terms containing a to the left, all other terms to the right
-4a=8
a=8/-4
a=-2
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