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2a-6+a-5+a-17=18
We move all terms to the left:
2a-6+a-5+a-17-(18)=0
We add all the numbers together, and all the variables
4a-46=0
We move all terms containing a to the left, all other terms to the right
4a=46
a=46/4
a=11+1/2
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