X^2-9x+21=7

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Solution for X^2-9x+21=7 equation: 


Simplifying
X2 + -9x + 21 = 7

Reorder the terms:
21 + X2 + -9x = 7

Solving
21 + X2 + -9x = 7

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '-21' to each side of the equation.
21 + X2 + -21 + -9x = 7 + -21

Reorder the terms:
21 + -21 + X2 + -9x = 7 + -21

Combine like terms: 21 + -21 = 0
0 + X2 + -9x = 7 + -21
X2 + -9x = 7 + -21

Combine like terms: 7 + -21 = -14
X2 + -9x = -14

Add '9x' to each side of the equation.
X2 + -9x + 9x = -14 + 9x

Combine like terms: -9x + 9x = 0
X2 + 0 = -14 + 9x
X2 = -14 + 9x

Simplifying
X2 = -14 + 9x

Reorder the terms:
14 + X2 + -9x = -14 + 9x + 14 + -9x

Reorder the terms:
14 + X2 + -9x = -14 + 14 + 9x + -9x

Combine like terms: -14 + 14 = 0
14 + X2 + -9x = 0 + 9x + -9x
14 + X2 + -9x = 9x + -9x

Combine like terms: 9x + -9x = 0
14 + X2 + -9x = 0

The solution to this equation could not be determined.

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