r+3+2r=21

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Solution for r+3+2r=21 equation: 


Simplifying
r + 3 + 2r = 21

Reorder the terms:
3 + r + 2r = 21

Combine like terms: r + 2r = 3r
3 + 3r = 21

Solving
3 + 3r = 21

Solving for variable 'r'.

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

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

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

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

Divide each side by '3'.
r = 6

Simplifying
r = 6

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