9x+3=7x+21

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Solution for 9x+3=7x+21 equation: 



9x+3=7x+21

We move all terms to the left:

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

We get rid of parentheses

9x-7x-21+3=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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