3r-3-3=-21

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Solution for 3r-3-3=-21 equation:


Simplifying
3r + -3 + -3 = -21

Reorder the terms:
-3 + -3 + 3r = -21

Combine like terms: -3 + -3 = -6
-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 = -15
3r = -15

Divide each side by '3'.
r = -5

Simplifying
r = -5

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