(x+3)2=225

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Solution for (x+3)2=225 equation: 



(x+3)2=225

We move all terms to the left:

(x+3)2-(225)=0

We multiply parentheses

2x+6-225=0

We add all the numbers together, and all the variables

2x-219=0

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

2x=219

x=219/2

x=109+1/2

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