2r+3+9r=21

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Solution for 2r+3+9r=21 equation:


Simplifying
2r + 3 + 9r = 21

Reorder the terms:
3 + 2r + 9r = 21

Combine like terms: 2r + 9r = 11r
3 + 11r = 21

Solving
3 + 11r = 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 + 11r = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 11r = 21 + -3
11r = 21 + -3

Combine like terms: 21 + -3 = 18
11r = 18

Divide each side by '11'.
r = 1.636363636

Simplifying
r = 1.636363636

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