3=.750(b-8)

Solution for 3=.750(b-8) equation:

Simplifying
3 = 0.750(b + -8)

Reorder the terms:
3 = 0.750(-8 + b)
3 = (-8 * 0.750 + b * 0.750)
3 = (-6 + 0.750b)

Solving
3 = -6 + 0.750b

Solving for variable 'b'.

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

Add '-0.750b' to each side of the equation.
3 + -0.750b = -6 + 0.750b + -0.750b

Combine like terms: 0.750b + -0.750b = 0.000
3 + -0.750b = -6 + 0.000
3 + -0.750b = -6

Add '-3' to each side of the equation.
3 + -3 + -0.750b = -6 + -3

Combine like terms: 3 + -3 = 0
0 + -0.750b = -6 + -3
-0.750b = -6 + -3

Combine like terms: -6 + -3 = -9
-0.750b = -9

Divide each side by '-0.750'.
b = 12

Simplifying
b = 12