x2+4=((x+1)(x+3)

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Solution for x2+4=((x+1)(x+3) equation: 



x2+4=((x+1)(x+3)

We move all terms to the left:

x2+4-(((x+1)(x+3))=0

We add all the numbers together, and all the variables

x^2-(((x+1)(x+3))+4=0

We multiply parentheses ..

x^2-(((+x^2+3x+x+3))+4=0

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