(3+x)(x-7)=x*x+3

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Solution for (3+x)(x-7)=x*x+3 equation: 



(3+x)(x-7)=x*x+3

We move all terms to the left:

(3+x)(x-7)-(x*x+3)=0

We add all the numbers together, and all the variables

(x+3)(x-7)-(x*x+3)=0

We get rid of parentheses

(x+3)(x-7)-x*x-3=0

We multiply parentheses ..

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

Wy multiply elements

(+x^2-7x+3x-21)-1x^2-3=0

We get rid of parentheses

x^2-1x^2-7x+3x-21-3=0

We add all the numbers together, and all the variables

-4x-24=0

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

-4x=24

x=24/-4

x=-6

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