-4d+2(3+d)=-30

Solution for -4d+2(3+d)=-30 equation:

Simplifying
-4d + 2(3 + d) = -30
-4d + (3 * 2 + d * 2) = -30
-4d + (6 + 2d) = -30

Reorder the terms:
6 + -4d + 2d = -30

Combine like terms: -4d + 2d = -2d
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