-1=2(d-9)-9

Solution for -1=2(d-9)-9 equation:

Simplifying
-1 = 2(d + -9) + -9

Reorder the terms:
-1 = 2(-9 + d) + -9
-1 = (-9 * 2 + d * 2) + -9
-1 = (-18 + 2d) + -9

Reorder the terms:
-1 = -18 + -9 + 2d

Combine like terms: -18 + -9 = -27
-1 = -27 + 2d

Solving
-1 = -27 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
-1 + -2d = -27 + 2d + -2d

Combine like terms: 2d + -2d = 0
-1 + -2d = -27 + 0
-1 + -2d = -27

Add '1' to each side of the equation.
-1 + 1 + -2d = -27 + 1

Combine like terms: -1 + 1 = 0
0 + -2d = -27 + 1
-2d = -27 + 1

Combine like terms: -27 + 1 = -26
-2d = -26

Divide each side by '-2'.
d = 13

Simplifying
d = 13