-20.5=3.5b-4b

Solution for -20.5=3.5b-4b equation:

Simplifying
-20.5 = 3.5b + -4b

Combine like terms: 3.5b + -4b = -0.5b
-20.5 = -0.5b

Solving
-20.5 = -0.5b

Solving for variable 'b'.

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

Add '0.5b' to each side of the equation.
-20.5 + 0.5b = -0.5b + 0.5b

Combine like terms: -0.5b + 0.5b = 0.0
-20.5 + 0.5b = 0.0

Add '20.5' to each side of the equation.
-20.5 + 20.5 + 0.5b = 0.0 + 20.5

Combine like terms: -20.5 + 20.5 = 0.0
0.0 + 0.5b = 0.0 + 20.5
0.5b = 0.0 + 20.5

Combine like terms: 0.0 + 20.5 = 20.5
0.5b = 20.5

Divide each side by '0.5'.
b = 41

Simplifying
b = 41