120=.2(768)+b

Solution for 120=.2(768)+b equation:

Simplifying
120 = 0.2(768) + b

Multiply 0.2 * 768
120 = 153.6 + b

Solving
120 = 153.6 + 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.
120 + -1b = 153.6 + b + -1b

Combine like terms: b + -1b = 0
120 + -1b = 153.6 + 0
120 + -1b = 153.6

Add '-120' to each side of the equation.
120 + -120 + -1b = 153.6 + -120

Combine like terms: 120 + -120 = 0
0 + -1b = 153.6 + -120
-1b = 153.6 + -120

Combine like terms: 153.6 + -120 = 33.6
-1b = 33.6

Divide each side by '-1'.
b = -33.6

Simplifying
b = -33.6