r=(2d-1)(2-4d)

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Solution for r=(2d-1)(2-4d) equation: 


Simplifying
r = (2d + -1)(2 + -4d)

Reorder the terms:
r = (-1 + 2d)(2 + -4d)

Multiply (-1 + 2d) * (2 + -4d)
r = (-1(2 + -4d) + 2d * (2 + -4d))
r = ((2 * -1 + -4d * -1) + 2d * (2 + -4d))
r = ((-2 + 4d) + 2d * (2 + -4d))
r = (-2 + 4d + (2 * 2d + -4d * 2d))
r = (-2 + 4d + (4d + -8d2))

Combine like terms: 4d + 4d = 8d
r = (-2 + 8d + -8d2)

Solving
r = -2 + 8d + -8d2

Solving for variable 'r'.

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

Simplifying
r = -2 + 8d + -8d2

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