5+7x=9x+21

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Solution for 5+7x=9x+21 equation: 



5+7x=9x+21

We move all terms to the left:

5+7x-(9x+21)=0

We get rid of parentheses

7x-9x-21+5=0

We add all the numbers together, and all the variables

-2x-16=0

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

-2x=16

x=16/-2

x=-8

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