13=a+18

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Solution for 13=a+18 equation: 



13=a+18

We move all terms to the left:

13-(a+18)=0

We get rid of parentheses

-a-18+13=0

We add all the numbers together, and all the variables

-1a-5=0

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

-a=5

a=5/-1

a=-5

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