3(r-6)=-21

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Solution for 3(r-6)=-21 equation: 


Simplifying
3(r + -6) = -21

Reorder the terms:
3(-6 + r) = -21
(-6 * 3 + r * 3) = -21
(-18 + 3r) = -21

Solving
-18 + 3r = -21

Solving for variable 'r'.

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

Add '18' to each side of the equation.
-18 + 18 + 3r = -21 + 18

Combine like terms: -18 + 18 = 0
0 + 3r = -21 + 18
3r = -21 + 18

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

Divide each side by '3'.
r = -1

Simplifying
r = -1

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