90-9=3D-3

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Solution for 90-9=3D-3 equation:


Simplifying
90 + -9 = 3D + -3

Combine like terms: 90 + -9 = 81
81 = 3D + -3

Reorder the terms:
81 = -3 + 3D

Solving
81 = -3 + 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.
81 + -3D = -3 + 3D + -3D

Combine like terms: 3D + -3D = 0
81 + -3D = -3 + 0
81 + -3D = -3

Add '-81' to each side of the equation.
81 + -81 + -3D = -3 + -81

Combine like terms: 81 + -81 = 0
0 + -3D = -3 + -81
-3D = -3 + -81

Combine like terms: -3 + -81 = -84
-3D = -84

Divide each side by '-3'.
D = 28

Simplifying
D = 28

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