d-1=-20

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Solution for d-1=-20 equation: 


Simplifying
d + -1 = -20

Reorder the terms:
-1 + d = -20

Solving
-1 + d = -20

Solving for variable 'd'.

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

Add '1' to each side of the equation.
-1 + 1 + d = -20 + 1

Combine like terms: -1 + 1 = 0
0 + d = -20 + 1
d = -20 + 1

Combine like terms: -20 + 1 = -19
d = -19

Simplifying
d = -19

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