a+a+a-1=17

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Solution for a+a+a-1=17 equation: 



a+a+a-1=17

We move all terms to the left:

a+a+a-1-(17)=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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