-7(3+b)=b+3

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

Simplifying
-7(3 + b) = b + 3
(3 * -7 + b * -7) = b + 3
(-21 + -7b) = b + 3

Reorder the terms:
-21 + -7b = 3 + b

Solving
-21 + -7b = 3 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
-21 + -7b + -1b = 3 + b + -1b

Combine like terms: -7b + -1b = -8b
-21 + -8b = 3 + b + -1b

Combine like terms: b + -1b = 0
-21 + -8b = 3 + 0
-21 + -8b = 3

Add '21' to each side of the equation.
-21 + 21 + -8b = 3 + 21

Combine like terms: -21 + 21 = 0
0 + -8b = 3 + 21
-8b = 3 + 21

Combine like terms: 3 + 21 = 24
-8b = 24

Divide each side by '-8'.
b = -3

Simplifying
b = -3