7(3b+15)=

Solution for 7(3b+15)= equation:

Simplifying
7(3b + 15) = 0

Reorder the terms:
7(15 + 3b) = 0
(15 * 7 + 3b * 7) = 0
(105 + 21b) = 0

Solving
105 + 21b = 0

Solving for variable 'b'.

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

Add '-105' to each side of the equation.
105 + -105 + 21b = 0 + -105

Combine like terms: 105 + -105 = 0
0 + 21b = 0 + -105
21b = 0 + -105

Combine like terms: 0 + -105 = -105
21b = -105

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

Simplifying
b = -5