-3(r-1)=21

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Solution for -3(r-1)=21 equation: 


Simplifying
-3(r + -1) = 21

Reorder the terms:
-3(-1 + r) = 21
(-1 * -3 + r * -3) = 21
(3 + -3r) = 21

Solving
3 + -3r = 21

Solving for variable 'r'.

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

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

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

Combine like terms: 21 + -3 = 18
-3r = 18

Divide each side by '-3'.
r = -6

Simplifying
r = -6

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