4d-9+2d=21

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Solution for 4d-9+2d=21 equation: 


Simplifying
4d + -9 + 2d = 21

Reorder the terms:
-9 + 4d + 2d = 21

Combine like terms: 4d + 2d = 6d
-9 + 6d = 21

Solving
-9 + 6d = 21

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + 6d = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 6d = 21 + 9
6d = 21 + 9

Combine like terms: 21 + 9 = 30
6d = 30

Divide each side by '6'.
d = 5

Simplifying
d = 5

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