3[2d+7]=39

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Solution for 3[2d+7]=39 equation: 


Simplifying
3[2d + 7] = 39

Reorder the terms:
3[7 + 2d] = 39
[7 * 3 + 2d * 3] = 39
[21 + 6d] = 39

Solving
21 + 6d = 39

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 + 6d = 39 + -21

Combine like terms: 21 + -21 = 0
0 + 6d = 39 + -21
6d = 39 + -21

Combine like terms: 39 + -21 = 18
6d = 18

Divide each side by '6'.
d = 3

Simplifying
d = 3

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