a-(-4)=21

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Solution for a-(-4)=21 equation: 



a-(-4)=21

We move all terms to the left:

a-(-4)-(21)=0

determiningTheFunctionDomain
a-21-(-4)=0

We add all the numbers together, and all the variables

a-17=0

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

a=17

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