15=-1+2a

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Solution for 15=-1+2a equation: 



15=-1+2a

We move all terms to the left:

15-(-1+2a)=0

We add all the numbers together, and all the variables

-(2a-1)+15=0

We get rid of parentheses

-2a+1+15=0

We add all the numbers together, and all the variables

-2a+16=0

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

-2a=-16

a=-16/-2

a=+8

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