-18=-7a+a

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Solution for -18=-7a+a equation: 



-18=-7a+a

We move all terms to the left:

-18-(-7a+a)=0

We add all the numbers together, and all the variables

-(-6a)-18=0

We get rid of parentheses

6a-18=0

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

6a=18

a=18/6

a=3

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