(20+x)2+40=500

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Solution for (20+x)2+40=500 equation: 



(20+x)2+40=500

We move all terms to the left:

(20+x)2+40-(500)=0

We add all the numbers together, and all the variables

(x+20)2+40-500=0

We add all the numbers together, and all the variables

(x+20)2-460=0

We multiply parentheses

2x+40-460=0

We add all the numbers together, and all the variables

2x-420=0

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

2x=420

x=420/2

x=210

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