3r-21=7

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Solution for 3r-21=7 equation: 


Simplifying
3r + -21 = 7

Reorder the terms:
-21 + 3r = 7

Solving
-21 + 3r = 7

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 3r = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 3r = 7 + 21
3r = 7 + 21

Combine like terms: 7 + 21 = 28
3r = 28

Divide each side by '3'.
r = 9.333333333

Simplifying
r = 9.333333333

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