-2a+13=-21

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Solution for -2a+13=-21 equation: 



-2a+13=-21

We move all terms to the left:

-2a+13-(-21)=0

We add all the numbers together, and all the variables

-2a+34=0

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

-2a=-34

a=-34/-2

a=+17

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