7x-21+2x=6

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Solution for 7x-21+2x=6 equation: 



7x-21+2x=6

We move all terms to the left:

7x-21+2x-(6)=0

We add all the numbers together, and all the variables

9x-27=0

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

9x=27

x=27/9

x=3

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