3d+18=21

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Solution for 3d+18=21 equation: 


Simplifying
3d + 18 = 21

Reorder the terms:
18 + 3d = 21

Solving
18 + 3d = 21

Solving for variable 'd'.

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

Add '-18' to each side of the equation.
18 + -18 + 3d = 21 + -18

Combine like terms: 18 + -18 = 0
0 + 3d = 21 + -18
3d = 21 + -18

Combine like terms: 21 + -18 = 3
3d = 3

Divide each side by '3'.
d = 1

Simplifying
d = 1

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