3x+-4+2x=21

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Solution for 3x+-4+2x=21 equation: 



3x+-4+2x=21

We move all terms to the left:

3x+-4+2x-(21)=0

determiningTheFunctionDomain
3x+2x-4-21+=0

We add all the numbers together, and all the variables

5x=0

x=0/5

x=0

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