(x+7)(x+9)=(x+3)(x+21

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Solution for (x+7)(x+9)=(x+3)(x+21 equation: 



(x+7)(x+9)=(x+3)(x+21

We move all terms to the left:

(x+7)(x+9)-((x+3)(x+21)=0

We multiply parentheses ..

(+x^2+9x+7x+63)-((x+3)(x+21)=0



We calculate terms in parentheses: -((x+3)(x+21), so:

(x+3)(x+21



We get rid of parentheses

x^2+9x+7x-((x+3)(x+21)+63=0

We multiply parentheses ..

x^2-((+x^2+21x+3x+63)+63+9x+7x=0

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