-18=-17+a

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Solution for -18=-17+a equation: 



-18=-17+a

We move all terms to the left:

-18-(-17+a)=0

We add all the numbers together, and all the variables

-(a-17)-18=0

We get rid of parentheses

-a+17-18=0

We add all the numbers together, and all the variables

-1a-1=0

We move all terms containing a to the left, all other terms to the right

-a=1

a=1/-1

a=-1

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