X(4-x)+X2-9=x

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Solution for X(4-x)+X2-9=x equation: 



X(4-X)+X2-9=X

We move all terms to the left:

X(4-X)+X2-9-(X)=0

We add all the numbers together, and all the variables

X(-1X+4)+X2-X-9=0

We add all the numbers together, and all the variables

X^2-1X+X(-1X+4)-9=0

We multiply parentheses

X^2-1X^2-1X+4X-9=0

We add all the numbers together, and all the variables

3X-9=0

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

3X=9

X=9/3

X=3

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