4-8r=20

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Solution for 4-8r=20 equation: 


Simplifying
4 + -8r = 20

Solving
4 + -8r = 20

Solving for variable 'r'.

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

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

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

Combine like terms: 20 + -4 = 16
-8r = 16

Divide each side by '-8'.
r = -2

Simplifying
r = -2

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