-3(2-r)=21

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Solution for -3(2-r)=21 equation: 


Simplifying
-3(2 + -1r) = 21
(2 * -3 + -1r * -3) = 21
(-6 + 3r) = 21

Solving
-6 + 3r = 21

Solving for variable 'r'.

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

Add '6' to each side of the equation.
-6 + 6 + 3r = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 3r = 21 + 6
3r = 21 + 6

Combine like terms: 21 + 6 = 27
3r = 27

Divide each side by '3'.
r = 9

Simplifying
r = 9

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