d-21=87

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Solution for d-21=87 equation: 


Simplifying
d + -21 = 87

Reorder the terms:
-21 + d = 87

Solving
-21 + d = 87

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 = 87 + 21

Combine like terms: -21 + 21 = 0
0 + d = 87 + 21
d = 87 + 21

Combine like terms: 87 + 21 = 108
d = 108

Simplifying
d = 108

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