-9(-b-20)=-20-b

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Solution for -9(-b-20)=-20-b equation:


Simplifying
-9(-1b + -20) = -20 + -1b

Reorder the terms:
-9(-20 + -1b) = -20 + -1b
(-20 * -9 + -1b * -9) = -20 + -1b
(180 + 9b) = -20 + -1b

Solving
180 + 9b = -20 + -1b

Solving for variable 'b'.

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

Add 'b' to each side of the equation.
180 + 9b + b = -20 + -1b + b

Combine like terms: 9b + b = 10b
180 + 10b = -20 + -1b + b

Combine like terms: -1b + b = 0
180 + 10b = -20 + 0
180 + 10b = -20

Add '-180' to each side of the equation.
180 + -180 + 10b = -20 + -180

Combine like terms: 180 + -180 = 0
0 + 10b = -20 + -180
10b = -20 + -180

Combine like terms: -20 + -180 = -200
10b = -200

Divide each side by '10'.
b = -20

Simplifying
b = -20

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