3d-7(3+2d)=30

Solution for 3d-7(3+2d)=30 equation:

Simplifying
3d + -7(3 + 2d) = 30
3d + (3 * -7 + 2d * -7) = 30
3d + (-21 + -14d) = 30

Reorder the terms:
-21 + 3d + -14d = 30

Combine like terms: 3d + -14d = -11d
-21 + -11d = 30

Solving
-21 + -11d = 30

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 + -11d = 30 + 21

Combine like terms: -21 + 21 = 0
0 + -11d = 30 + 21
-11d = 30 + 21

Combine like terms: 30 + 21 = 51
-11d = 51

Divide each side by '-11'.
d = -4.636363636

Simplifying
d = -4.636363636