-2r=r+21

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Solution for -2r=r+21 equation: 


Simplifying
-2r = r + 21

Reorder the terms:
-2r = 21 + r

Solving
-2r = 21 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-2r + -1r = 21 + r + -1r

Combine like terms: -2r + -1r = -3r
-3r = 21 + r + -1r

Combine like terms: r + -1r = 0
-3r = 21 + 0
-3r = 21

Divide each side by '-3'.
r = -7

Simplifying
r = -7

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