2r-4=-20

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Solution for 2r-4=-20 equation: 


Simplifying
2r + -4 = -20

Reorder the terms:
-4 + 2r = -20

Solving
-4 + 2r = -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 + 2r = -20 + 4

Combine like terms: -4 + 4 = 0
0 + 2r = -20 + 4
2r = -20 + 4

Combine like terms: -20 + 4 = -16
2r = -16

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

Simplifying
r = -8

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