X^2+13X+C=0

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Solution for X^2+13X+C=0 equation: 


Simplifying
X2 + 13X + C = 0

Reorder the terms:
C + 13X + X2 = 0

Solving
C + 13X + X2 = 0

Solving for variable 'C'.

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

Add '-13X' to each side of the equation.
C + 13X + -13X + X2 = 0 + -13X

Combine like terms: 13X + -13X = 0
C + 0 + X2 = 0 + -13X
C + X2 = 0 + -13X
Remove the zero:
C + X2 = -13X

Add '-1X2' to each side of the equation.
C + X2 + -1X2 = -13X + -1X2

Combine like terms: X2 + -1X2 = 0
C + 0 = -13X + -1X2
C = -13X + -1X2

Simplifying
C = -13X + -1X2

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