d-3=-21

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Solution for d-3=-21 equation: 


Simplifying
d + -3 = -21

Reorder the terms:
-3 + d = -21

Solving
-3 + d = -21

Solving for variable 'd'.

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

Add '3' to each side of the equation.
-3 + 3 + d = -21 + 3

Combine like terms: -3 + 3 = 0
0 + d = -21 + 3
d = -21 + 3

Combine like terms: -21 + 3 = -18
d = -18

Simplifying
d = -18

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