6r-21=3r

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Solution for 6r-21=3r equation:


Simplifying
6r + -21 = 3r

Reorder the terms:
-21 + 6r = 3r

Solving
-21 + 6r = 3r

Solving for variable 'r'.

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

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

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

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

Add '21' to each side of the equation.
-21 + 21 + 3r = 0 + 21

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

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

Divide each side by '3'.
r = 7

Simplifying
r = 7

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