6+4r+r=21

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Solution for 6+4r+r=21 equation: 


Simplifying
6 + 4r + r = 21

Combine like terms: 4r + r = 5r
6 + 5r = 21

Solving
6 + 5r = 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 + 5r = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 5r = 21 + -6
5r = 21 + -6

Combine like terms: 21 + -6 = 15
5r = 15

Divide each side by '5'.
r = 3

Simplifying
r = 3

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