4y+8y+21=129

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Solution for 4y+8y+21=129 equation: 



4y+8y+21=129

We move all terms to the left:

4y+8y+21-(129)=0

We add all the numbers together, and all the variables

12y-108=0

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

12y=108

y=108/12

y=9

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