x-(-12)+2x=21

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Solution for x-(-12)+2x=21 equation: 



x-(-12)+2x=21

We move all terms to the left:

x-(-12)+2x-(21)=0

determiningTheFunctionDomain
x+2x-21-(-12)=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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