d-4=-21

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Solution for d-4=-21 equation: 


Simplifying
d + -4 = -21

Reorder the terms:
-4 + d = -21

Solving
-4 + d = -21

Solving for variable 'd'.

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

Add '4' to each side of the equation.
-4 + 4 + d = -21 + 4

Combine like terms: -4 + 4 = 0
0 + d = -21 + 4
d = -21 + 4

Combine like terms: -21 + 4 = -17
d = -17

Simplifying
d = -17

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