13=r+3r

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Solution for 13=r+3r equation:


Simplifying
13 = r + 3r

Combine like terms: r + 3r = 4r
13 = 4r

Solving
13 = 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
13 + -4r = 4r + -4r

Combine like terms: 4r + -4r = 0
13 + -4r = 0

Add '-13' to each side of the equation.
13 + -13 + -4r = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -4r = 0 + -13
-4r = 0 + -13

Combine like terms: 0 + -13 = -13
-4r = -13

Divide each side by '-4'.
r = 3.25

Simplifying
r = 3.25

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