3(12-r)=30

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Solution for 3(12-r)=30 equation: 


Simplifying
3(12 + -1r) = 30
(12 * 3 + -1r * 3) = 30
(36 + -3r) = 30

Solving
36 + -3r = 30

Solving for variable 'r'.

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

Add '-36' to each side of the equation.
36 + -36 + -3r = 30 + -36

Combine like terms: 36 + -36 = 0
0 + -3r = 30 + -36
-3r = 30 + -36

Combine like terms: 30 + -36 = -6
-3r = -6

Divide each side by '-3'.
r = 2

Simplifying
r = 2

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