5a-(-13a)-(-8a)-(-7a)-13a=-20

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Solution for 5a-(-13a)-(-8a)-(-7a)-13a=-20 equation: 



5a-(-13a)-(-8a)-(-7a)-13a=-20

We move all terms to the left:

5a-(-13a)-(-8a)-(-7a)-13a-(-20)=0

We add all the numbers together, and all the variables

-8a-(-13a)-(-8a)-(-7a)+20=0

We get rid of parentheses

-8a+13a+8a+7a+20=0

We add all the numbers together, and all the variables

20a+20=0

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

20a=-20

a=-20/20

a=-1

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