7d-9=4d

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Solution for 7d-9=4d equation:


Simplifying
7d + -9 = 4d

Reorder the terms:
-9 + 7d = 4d

Solving
-9 + 7d = 4d

Solving for variable 'd'.

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

Add '-4d' to each side of the equation.
-9 + 7d + -4d = 4d + -4d

Combine like terms: 7d + -4d = 3d
-9 + 3d = 4d + -4d

Combine like terms: 4d + -4d = 0
-9 + 3d = 0

Add '9' to each side of the equation.
-9 + 9 + 3d = 0 + 9

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

Combine like terms: 0 + 9 = 9
3d = 9

Divide each side by '3'.
d = 3

Simplifying
d = 3

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