10-d=-21

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Solution for 10-d=-21 equation: 


Simplifying
10 + -1d = -21

Solving
10 + -1d = -21

Solving for variable 'd'.

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

Add '-10' to each side of the equation.
10 + -10 + -1d = -21 + -10

Combine like terms: 10 + -10 = 0
0 + -1d = -21 + -10
-1d = -21 + -10

Combine like terms: -21 + -10 = -31
-1d = -31

Divide each side by '-1'.
d = 31

Simplifying
d = 31

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