7a-a=-18

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Solution for 7a-a=-18 equation: 



7a-a=-18

We move all terms to the left:

7a-a-(-18)=0

We add all the numbers together, and all the variables

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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