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17a-13a-2a+4a-3a=18
We move all terms to the left:
17a-13a-2a+4a-3a-(18)=0
We add all the numbers together, and all the variables
3a-18=0
We move all terms containing a to the left, all other terms to the right
3a=18
a=18/3
a=6
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