105=d-21

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Solution for 105=d-21 equation:


Simplifying
105 = d + -21

Reorder the terms:
105 = -21 + d

Solving
105 = -21 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
105 + -1d = -21 + d + -1d

Combine like terms: d + -1d = 0
105 + -1d = -21 + 0
105 + -1d = -21

Add '-105' to each side of the equation.
105 + -105 + -1d = -21 + -105

Combine like terms: 105 + -105 = 0
0 + -1d = -21 + -105
-1d = -21 + -105

Combine like terms: -21 + -105 = -126
-1d = -126

Divide each side by '-1'.
d = 126

Simplifying
d = 126

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