8-4r=20

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Solution for 8-4r=20 equation: 


Simplifying
8 + -4r = 20

Solving
8 + -4r = 20

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 + -4r = 20 + -8

Combine like terms: 8 + -8 = 0
0 + -4r = 20 + -8
-4r = 20 + -8

Combine like terms: 20 + -8 = 12
-4r = 12

Divide each side by '-4'.
r = -3

Simplifying
r = -3

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