-2r=21-5r

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Solution for -2r=21-5r equation: 


Simplifying
-2r = 21 + -5r

Solving
-2r = 21 + -5r

Solving for variable 'r'.

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

Add '5r' to each side of the equation.
-2r + 5r = 21 + -5r + 5r

Combine like terms: -2r + 5r = 3r
3r = 21 + -5r + 5r

Combine like terms: -5r + 5r = 0
3r = 21 + 0
3r = 21

Divide each side by '3'.
r = 7

Simplifying
r = 7

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