x-(-4)=15=12

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Solution for x-(-4)=15=12 equation: 



x-(-4)=15=12

We move all terms to the left:

x-(-4)-(15)=0

determiningTheFunctionDomain
x-15-(-4)=0

We add all the numbers together, and all the variables

x-11=0

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

x=11

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