20=0.5(6+b)4

Solution for 20=0.5(6+b)4 equation:

Simplifying
20 = 0.5(6 + b) * 4

Reorder the terms for easier multiplication:
20 = 0.5 * 4(6 + b)

Multiply 0.5 * 4
20 = 2(6 + b)
20 = (6 * 2 + b * 2)
20 = (12 + 2b)

Solving
20 = 12 + 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
20 + -2b = 12 + 2b + -2b

Combine like terms: 2b + -2b = 0
20 + -2b = 12 + 0
20 + -2b = 12

Add '-20' to each side of the equation.
20 + -20 + -2b = 12 + -20

Combine like terms: 20 + -20 = 0
0 + -2b = 12 + -20
-2b = 12 + -20

Combine like terms: 12 + -20 = -8
-2b = -8

Divide each side by '-2'.
b = 4

Simplifying
b = 4