31-d=10

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Solution for 31-d=10 equation: 


Simplifying
31 + -1d = 10

Solving
31 + -1d = 10

Solving for variable 'd'.

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

Add '-31' to each side of the equation.
31 + -31 + -1d = 10 + -31

Combine like terms: 31 + -31 = 0
0 + -1d = 10 + -31
-1d = 10 + -31

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

Divide each side by '-1'.
d = 21

Simplifying
d = 21

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