-3[D-7]=6

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Solution for -3[D-7]=6 equation: 


Simplifying
-3[D + -7] = 6

Reorder the terms:
-3[-7 + D] = 6
[-7 * -3 + D * -3] = 6
[21 + -3D] = 6

Solving
21 + -3D = 6

Solving for variable 'D'.

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

Add '-21' to each side of the equation.
21 + -21 + -3D = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -3D = 6 + -21
-3D = 6 + -21

Combine like terms: 6 + -21 = -15
-3D = -15

Divide each side by '-3'.
D = 5

Simplifying
D = 5

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