3(3+r)+15=51

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Solution for 3(3+r)+15=51 equation: 


Simplifying
3(3 + r) + 15 = 51
(3 * 3 + r * 3) + 15 = 51
(9 + 3r) + 15 = 51

Reorder the terms:
9 + 15 + 3r = 51

Combine like terms: 9 + 15 = 24
24 + 3r = 51

Solving
24 + 3r = 51

Solving for variable 'r'.

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

Add '-24' to each side of the equation.
24 + -24 + 3r = 51 + -24

Combine like terms: 24 + -24 = 0
0 + 3r = 51 + -24
3r = 51 + -24

Combine like terms: 51 + -24 = 27
3r = 27

Divide each side by '3'.
r = 9

Simplifying
r = 9

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