-2(x-9)-20=-1

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Solution for -2(x-9)-20=-1 equation: 


Simplifying
-2(x + -9) + -20 = -1

Reorder the terms:
-2(-9 + x) + -20 = -1
(-9 * -2 + x * -2) + -20 = -1
(18 + -2x) + -20 = -1

Reorder the terms:
18 + -20 + -2x = -1

Combine like terms: 18 + -20 = -2
-2 + -2x = -1

Solving
-2 + -2x = -1

Solving for variable 'x'.

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

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

Combine like terms: -2 + 2 = 0
0 + -2x = -1 + 2
-2x = -1 + 2

Combine like terms: -1 + 2 = 1
-2x = 1

Divide each side by '-2'.
x = -0.5

Simplifying
x = -0.5

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