(b+3)(-7)=

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

Simplifying
(b + 3)(-7) = 0

Reorder the terms:
(3 + b)(-7) = 0

Reorder the terms for easier multiplication:
-7(3 + b) = 0
(3 * -7 + b * -7) = 0
(-21 + -7b) = 0

Solving
-21 + -7b = 0

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + -7b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -7b = 0 + 21
-7b = 0 + 21

Combine like terms: 0 + 21 = 21
-7b = 21

Divide each side by '-7'.
b = -3

Simplifying
b = -3