d-21=-20

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Solution for d-21=-20 equation: 


Simplifying
d + -21 = -20

Reorder the terms:
-21 + d = -20

Solving
-21 + d = -20

Solving for variable 'd'.

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

Add '21' to each side of the equation.
-21 + 21 + d = -20 + 21

Combine like terms: -21 + 21 = 0
0 + d = -20 + 21
d = -20 + 21

Combine like terms: -20 + 21 = 1
d = 1

Simplifying
d = 1

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