57+9+9x=129

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Solution for 57+9+9x=129 equation: 



57+9+9x=129

We move all terms to the left:

57+9+9x-(129)=0

We add all the numbers together, and all the variables

9x-63=0

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

9x=63

x=63/9

x=7

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