(q-4)2=20

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Solution for (q-4)2=20 equation: 



(q-4)2=20

We move all terms to the left:

(q-4)2-(20)=0

We multiply parentheses

2q-8-20=0

We add all the numbers together, and all the variables

2q-28=0

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

2q=28

q=28/2

q=14

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