y=d(d-21)

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Solution for y=d(d-21) equation: 


Simplifying
y = d(d + -21)

Reorder the terms:
y = d(-21 + d)
y = (-21 * d + d * d)
y = (-21d + d2)

Solving
y = -21d + d2

Solving for variable 'y'.

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

Simplifying
y = -21d + d2

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