5d+9=3d+21

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Solution for 5d+9=3d+21 equation:


Simplifying
5d + 9 = 3d + 21

Reorder the terms:
9 + 5d = 3d + 21

Reorder the terms:
9 + 5d = 21 + 3d

Solving
9 + 5d = 21 + 3d

Solving for variable 'd'.

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

Add '-3d' to each side of the equation.
9 + 5d + -3d = 21 + 3d + -3d

Combine like terms: 5d + -3d = 2d
9 + 2d = 21 + 3d + -3d

Combine like terms: 3d + -3d = 0
9 + 2d = 21 + 0
9 + 2d = 21

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

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

Combine like terms: 21 + -9 = 12
2d = 12

Divide each side by '2'.
d = 6

Simplifying
d = 6

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