(6+y)2-81=0

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Solution for (6+y)2-81=0 equation: 



(6+y)2-81=0

We add all the numbers together, and all the variables

(y+6)2-81=0

We multiply parentheses

2y+12-81=0

We add all the numbers together, and all the variables

2y-69=0

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

2y=69

y=69/2

y=34+1/2

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