r+3r=45

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Solution for r+3r=45 equation: 


Simplifying
r + 3r = 45

Combine like terms: r + 3r = 4r
4r = 45

Solving
4r = 45

Solving for variable 'r'.

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

Divide each side by '4'.
r = 11.25

Simplifying
r = 11.25

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