2d+6+4.5=-20.5

Solution for 2d+6+4.5=-20.5 equation:

Simplifying
2d + 6 + 4.5 = -20.5

Reorder the terms:
6 + 4.5 + 2d = -20.5

Combine like terms: 6 + 4.5 = 10.5
10.5 + 2d = -20.5

Solving
10.5 + 2d = -20.5

Solving for variable 'd'.

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

Add '-10.5' to each side of the equation.
10.5 + -10.5 + 2d = -20.5 + -10.5

Combine like terms: 10.5 + -10.5 = 0.0
0.0 + 2d = -20.5 + -10.5
2d = -20.5 + -10.5

Combine like terms: -20.5 + -10.5 = -31
2d = -31

Divide each side by '2'.
d = -15.5

Simplifying
d = -15.5