21=d+19

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Solution for 21=d+19 equation:


Simplifying
21 = d + 19

Reorder the terms:
21 = 19 + d

Solving
21 = 19 + 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.
21 + -1d = 19 + d + -1d

Combine like terms: d + -1d = 0
21 + -1d = 19 + 0
21 + -1d = 19

Add '-21' to each side of the equation.
21 + -21 + -1d = 19 + -21

Combine like terms: 21 + -21 = 0
0 + -1d = 19 + -21
-1d = 19 + -21

Combine like terms: 19 + -21 = -2
-1d = -2

Divide each side by '-1'.
d = 2

Simplifying
d = 2

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