13=a+3(1)

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Solution for 13=a+3(1) equation: 



13=a+3(1)

We move all terms to the left:

13-(a+3(1))=0

We get rid of parentheses

-a-31+13=0

We add all the numbers together, and all the variables

-1a-18=0

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

-a=18

a=18/-1

a=-18

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