21b-32+7b-20b=

Solution for 21b-32+7b-20b= equation:

Simplifying
21b + -32 + 7b + -20b = 0

Reorder the terms:
-32 + 21b + 7b + -20b = 0

Combine like terms: 21b + 7b = 28b
-32 + 28b + -20b = 0

Combine like terms: 28b + -20b = 8b
-32 + 8b = 0

Solving
-32 + 8b = 0

Solving for variable 'b'.

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

Add '32' to each side of the equation.
-32 + 32 + 8b = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 8b = 0 + 32
8b = 0 + 32

Combine like terms: 0 + 32 = 32
8b = 32

Divide each side by '8'.
b = 4

Simplifying
b = 4