99=-3(7b+2)

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

Simplifying
99 = -3(7b + 2)

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

Solving
99 = -6 + -21b

Solving for variable 'b'.

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

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

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

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

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

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

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

Simplifying
b = -5