3d+21=15

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Solution for 3d+21=15 equation: 


Simplifying
3d + 21 = 15

Reorder the terms:
21 + 3d = 15

Solving
21 + 3d = 15

Solving for variable 'd'.

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

Add '-21' to each side of the equation.
21 + -21 + 3d = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3d = 15 + -21
3d = 15 + -21

Combine like terms: 15 + -21 = -6
3d = -6

Divide each side by '3'.
d = -2

Simplifying
d = -2

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