3x^2+6x+d=0

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Solution for 3x^2+6x+d=0 equation:


Simplifying
3x2 + 6x + d = 0

Reorder the terms:
d + 6x + 3x2 = 0

Solving
d + 6x + 3x2 = 0

Solving for variable 'd'.

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

Add '-6x' to each side of the equation.
d + 6x + -6x + 3x2 = 0 + -6x

Combine like terms: 6x + -6x = 0
d + 0 + 3x2 = 0 + -6x
d + 3x2 = 0 + -6x
Remove the zero:
d + 3x2 = -6x

Add '-3x2' to each side of the equation.
d + 3x2 + -3x2 = -6x + -3x2

Combine like terms: 3x2 + -3x2 = 0
d + 0 = -6x + -3x2
d = -6x + -3x2

Simplifying
d = -6x + -3x2

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