3x-x=21-3

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Solution for 3x-x=21-3 equation: 



3x-x=21-3

We move all terms to the left:

3x-x-(21-3)=0

We add all the numbers together, and all the variables

3x-x-18=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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