13-2d=21

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Solution for 13-2d=21 equation: 


Simplifying
13 + -2d = 21

Solving
13 + -2d = 21

Solving for variable 'd'.

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

Add '-13' to each side of the equation.
13 + -13 + -2d = 21 + -13

Combine like terms: 13 + -13 = 0
0 + -2d = 21 + -13
-2d = 21 + -13

Combine like terms: 21 + -13 = 8
-2d = 8

Divide each side by '-2'.
d = -4

Simplifying
d = -4

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