Zr+8=4R-20

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Solution for Zr+8=4R-20 equation: 


Simplifying
Zr + 8 = 4R + -20

Reorder the terms:
8 + rZ = 4R + -20

Reorder the terms:
8 + rZ = -20 + 4R

Solving
8 + rZ = -20 + 4R

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + rZ = -20 + -8 + 4R

Combine like terms: 8 + -8 = 0
0 + rZ = -20 + -8 + 4R
rZ = -20 + -8 + 4R

Combine like terms: -20 + -8 = -28
rZ = -28 + 4R

Divide each side by 'Z'.
r = -28Z-1 + 4RZ-1

Simplifying
r = -28Z-1 + 4RZ-1

Reorder the terms:
r = 4RZ-1 + -28Z-1

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