51.2=r+128

Solution for 51.2=r+128 equation:

Simplifying
51.2 = r + 128

Reorder the terms:
51.2 = 128 + r

Solving
51.2 = 128 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
51.2 + -1r = 128 + r + -1r

Combine like terms: r + -1r = 0
51.2 + -1r = 128 + 0
51.2 + -1r = 128

Add '-51.2' to each side of the equation.
51.2 + -51.2 + -1r = 128 + -51.2

Combine like terms: 51.2 + -51.2 = 0.0
0.0 + -1r = 128 + -51.2
-1r = 128 + -51.2

Combine like terms: 128 + -51.2 = 76.8
-1r = 76.8

Divide each side by '-1'.
r = -76.8

Simplifying
r = -76.8