9.9d^2=5.6w-9.2w+6.7d^2-1.8w

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Solution for 9.9d^2=5.6w-9.2w+6.7d^2-1.8w equation: 


Simplifying
9.9d2 = 5.6w + -9.2w + 6.7d2 + -1.8w

Reorder the terms:
9.9d2 = 6.7d2 + 5.6w + -9.2w + -1.8w

Combine like terms: 5.6w + -9.2w = -3.6w
9.9d2 = 6.7d2 + -3.6w + -1.8w

Combine like terms: -3.6w + -1.8w = -5.4w
9.9d2 = 6.7d2 + -5.4w

Solving
9.9d2 = 6.7d2 + -5.4w

Solving for variable 'd'.

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

Add '-6.7d2' to each side of the equation.
9.9d2 + -6.7d2 = 6.7d2 + -6.7d2 + -5.4w

Combine like terms: 9.9d2 + -6.7d2 = 3.2d2
3.2d2 = 6.7d2 + -6.7d2 + -5.4w

Combine like terms: 6.7d2 + -6.7d2 = 0.0
3.2d2 = 0.0 + -5.4w
3.2d2 = -5.4w

Divide each side by '3.2'.
d2 = -1.6875w

Simplifying
d2 = -1.6875w

Combine like terms: -1.6875w + 1.6875w = 0.0000
d2 + 1.6875w = 0.0000

The solution to this equation could not be determined.

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