2(-d)(-1)=20

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Solution for 2(-d)(-1)=20 equation: 


Simplifying
2(-1d)(-1) = 20

Remove parenthesis around (-1d)
2 * -1d(-1) = 20

Reorder the terms for easier multiplication:
2 * -1 * -1d = 20

Multiply 2 * -1
-2 * -1d = 20

Multiply -2 * -1
2d = 20

Solving
2d = 20

Solving for variable 'd'.

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

Divide each side by '2'.
d = 10

Simplifying
d = 10

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