(D-3)2=30

Solution for (D-3)2=30 equation:

Simplifying
(D + -3) * 2 = 30

Reorder the terms:
(-3 + D) * 2 = 30

Reorder the terms for easier multiplication:
2(-3 + D) = 30
(-3 * 2 + D * 2) = 30
(-6 + 2D) = 30

Solving
-6 + 2D = 30

Solving for variable 'D'.

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

Add '6' to each side of the equation.
-6 + 6 + 2D = 30 + 6

Combine like terms: -6 + 6 = 0
0 + 2D = 30 + 6
2D = 30 + 6

Combine like terms: 30 + 6 = 36
2D = 36

Divide each side by '2'.
D = 18

Simplifying
D = 18