-3(-7b-2)=-99

Solution for -3(-7b-2)=-99 equation:

Simplifying
-3(-7b + -2) = -99

Reorder the terms:
-3(-2 + -7b) = -99
(-2 * -3 + -7b * -3) = -99
(6 + 21b) = -99

Solving
6 + 21b = -99

Solving for variable 'b'.

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

Add '-6' to each side of the equation.
6 + -6 + 21b = -99 + -6

Combine like terms: 6 + -6 = 0
0 + 21b = -99 + -6
21b = -99 + -6

Combine like terms: -99 + -6 = -105
21b = -105

Divide each side by '21'.
b = -5

Simplifying
b = -5