a-(-13)=20

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Solution for a-(-13)=20 equation: 



a-(-13)=20

We move all terms to the left:

a-(-13)-(20)=0

determiningTheFunctionDomain
a-20-(-13)=0

We add all the numbers together, and all the variables

a-7=0

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

a=7

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