51.20=128-(r*128)

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Solution for 51.20=128-(r*128) equation: 


Simplifying
51.20 = 128 + -1(r * 128)

Reorder the terms for easier multiplication:
51.20 = 128 + -1(128r)

Remove parenthesis around (128r)
51.20 = 128 + -1 * 128r

Multiply -1 * 128
51.20 = 128 + -128r

Solving
51.20 = 128 + -128r

Solving for variable 'r'.

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

Add '128r' to each side of the equation.
51.20 + 128r = 128 + -128r + 128r

Combine like terms: -128r + 128r = 0
51.20 + 128r = 128 + 0
51.20 + 128r = 128

Add '-51.20' to each side of the equation.
51.20 + -51.20 + 128r = 128 + -51.20

Combine like terms: 51.20 + -51.20 = 0.00
0.00 + 128r = 128 + -51.20
128r = 128 + -51.20

Combine like terms: 128 + -51.20 = 76.8
128r = 76.8

Divide each side by '128'.
r = 0.6

Simplifying
r = 0.6

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