3r+r+3=15

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Solution for 3r+r+3=15 equation: 


Simplifying
3r + r + 3 = 15

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

Combine like terms: 3r + r = 4r
3 + 4r = 15

Solving
3 + 4r = 15

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 + 4r = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 4r = 15 + -3
4r = 15 + -3

Combine like terms: 15 + -3 = 12
4r = 12

Divide each side by '4'.
r = 3

Simplifying
r = 3

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