(7x+3)+(2x-9)=21

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Solution for (7x+3)+(2x-9)=21 equation: 



(7x+3)+(2x-9)=21

We move all terms to the left:

(7x+3)+(2x-9)-(21)=0

We get rid of parentheses

7x+2x+3-9-21=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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