7x+5=9x-21

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



7x+5=9x-21

We move all terms to the left:

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

We get rid of parentheses

7x-9x+21+5=0

We add all the numbers together, and all the variables

-2x+26=0

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

-2x=-26

x=-26/-2

x=+13

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