6x+21=129

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Solution for 6x+21=129 equation: 



6x+21=129

We move all terms to the left:

6x+21-(129)=0

We add all the numbers together, and all the variables

6x-108=0

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

6x=108

x=108/6

x=18

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