(X+7)(x+1)=x(x-1)-11

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Solution for (X+7)(x+1)=x(x-1)-11 equation: 



(X+7)(X+1)=X(X-1)-11

We move all terms to the left:

(X+7)(X+1)-(X(X-1)-11)=0

We multiply parentheses ..

(+X^2+X+7X+7)-(X(X-1)-11)=0



We calculate terms in parentheses: -(X(X-1)-11), so:

X(X-1)-11

We multiply parentheses

X^2-1X-11

Back to the equation:

-(X^2-1X-11)



We get rid of parentheses

X^2-X^2+X+7X+1X+7+11=0

We add all the numbers together, and all the variables

9X+18=0

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

9X=-18

X=-18/9

X=-2

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