13=9+a/2

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Solution for 13=9+a/2 equation: 



13=9+a/2

We move all terms to the left:

13-(9+a/2)=0

We add all the numbers together, and all the variables

-(a/2+9)+13=0

We get rid of parentheses

-a/2-9+13=0

We multiply all the terms by the denominator


-a-9*2+13*2=0

We add all the numbers together, and all the variables

-1a+8=0

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

-a=-8

a=-8/-1

a=+8

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