-4r=4r+21

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Solution for -4r=4r+21 equation: 


Simplifying
-4r = 4r + 21

Reorder the terms:
-4r = 21 + 4r

Solving
-4r = 21 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-4r + -4r = 21 + 4r + -4r

Combine like terms: -4r + -4r = -8r
-8r = 21 + 4r + -4r

Combine like terms: 4r + -4r = 0
-8r = 21 + 0
-8r = 21

Divide each side by '-8'.
r = -2.625

Simplifying
r = -2.625

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