x+x-(-3)=12

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Solution for x+x-(-3)=12 equation: 



x+x-(-3)=12

We move all terms to the left:

x+x-(-3)-(12)=0

determiningTheFunctionDomain
x+x-12-(-3)=0

We add all the numbers together, and all the variables

2x-9=0

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

2x=9

x=9/2

x=4+1/2

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