(a+20)2=81

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Solution for (a+20)2=81 equation: 



(a+20)2=81

We move all terms to the left:

(a+20)2-(81)=0

We multiply parentheses

2a+40-81=0

We add all the numbers together, and all the variables

2a-41=0

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

2a=41

a=41/2

a=20+1/2

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