7d-9=2d+21

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Solution for 7d-9=2d+21 equation:


Simplifying
7d + -9 = 2d + 21

Reorder the terms:
-9 + 7d = 2d + 21

Reorder the terms:
-9 + 7d = 21 + 2d

Solving
-9 + 7d = 21 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
-9 + 7d + -2d = 21 + 2d + -2d

Combine like terms: 7d + -2d = 5d
-9 + 5d = 21 + 2d + -2d

Combine like terms: 2d + -2d = 0
-9 + 5d = 21 + 0
-9 + 5d = 21

Add '9' to each side of the equation.
-9 + 9 + 5d = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 5d = 21 + 9
5d = 21 + 9

Combine like terms: 21 + 9 = 30
5d = 30

Divide each side by '5'.
d = 6

Simplifying
d = 6

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