20=-d+6

Solution for 20=-d+6 equation:

Simplifying
20 = -1d + 6

Reorder the terms:
20 = 6 + -1d

Solving
20 = 6 + -1d

Solving for variable 'd'.

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

Add 'd' to each side of the equation.
20 + d = 6 + -1d + d

Combine like terms: -1d + d = 0
20 + d = 6 + 0
20 + d = 6

Add '-20' to each side of the equation.
20 + -20 + d = 6 + -20

Combine like terms: 20 + -20 = 0
0 + d = 6 + -20
d = 6 + -20

Combine like terms: 6 + -20 = -14
d = -14

Simplifying
d = -14