(X-3)(x+12)=x(x+1)

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Solution for (X-3)(x+12)=x(x+1) equation: 



(X-3)(X+12)=X(X+1)

We move all terms to the left:

(X-3)(X+12)-(X(X+1))=0

We multiply parentheses ..

(+X^2+12X-3X-36)-(X(X+1))=0



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

X(X+1)

We multiply parentheses

X^2+X

Back to the equation:

-(X^2+X)



We get rid of parentheses

X^2-X^2+12X-3X-X-36=0

We add all the numbers together, and all the variables

8X-36=0

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

8X=36

X=36/8

X=4+1/2

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