d+7=21

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Solution for d+7=21 equation: 


Simplifying
d + 7 = 21

Reorder the terms:
7 + d = 21

Solving
7 + d = 21

Solving for variable 'd'.

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

Add '-7' to each side of the equation.
7 + -7 + d = 21 + -7

Combine like terms: 7 + -7 = 0
0 + d = 21 + -7
d = 21 + -7

Combine like terms: 21 + -7 = 14
d = 14

Simplifying
d = 14

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