12=3r+r

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Solution for 12=3r+r equation:


Simplifying
12 = 3r + r

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

Solving
12 = 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.
12 + -4r = 4r + -4r

Combine like terms: 4r + -4r = 0
12 + -4r = 0

Add '-12' to each side of the equation.
12 + -12 + -4r = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -4r = 0 + -12
-4r = 0 + -12

Combine like terms: 0 + -12 = -12
-4r = -12

Divide each side by '-4'.
r = 3

Simplifying
r = 3

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