9x+51=21x-45

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Solution for 9x+51=21x-45 equation: 



9x+51=21x-45

We move all terms to the left:

9x+51-(21x-45)=0

We get rid of parentheses

9x-21x+45+51=0

We add all the numbers together, and all the variables

-12x+96=0

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

-12x=-96

x=-96/-12

x=+8

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