x-(-21)=6

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Solution for x-(-21)=6 equation: 



x-(-21)=6

We move all terms to the left:

x-(-21)-(6)=0

determiningTheFunctionDomain
x-6-(-21)=0

We add all the numbers together, and all the variables

x+15=0

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

x=-15

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