3d+7-9=21

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Solution for 3d+7-9=21 equation:


Simplifying
3d + 7 + -9 = 21

Reorder the terms:
7 + -9 + 3d = 21

Combine like terms: 7 + -9 = -2
-2 + 3d = 21

Solving
-2 + 3d = 21

Solving for variable 'd'.

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

Add '2' to each side of the equation.
-2 + 2 + 3d = 21 + 2

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

Combine like terms: 21 + 2 = 23
3d = 23

Divide each side by '3'.
d = 7.666666667

Simplifying
d = 7.666666667

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