3(r-13)=12

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Solution for 3(r-13)=12 equation: 


Simplifying
3(r + -13) = 12

Reorder the terms:
3(-13 + r) = 12
(-13 * 3 + r * 3) = 12
(-39 + 3r) = 12

Solving
-39 + 3r = 12

Solving for variable 'r'.

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

Add '39' to each side of the equation.
-39 + 39 + 3r = 12 + 39

Combine like terms: -39 + 39 = 0
0 + 3r = 12 + 39
3r = 12 + 39

Combine like terms: 12 + 39 = 51
3r = 51

Divide each side by '3'.
r = 17

Simplifying
r = 17

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