12=3(3-r)

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


Simplifying
12 = 3(3 + -1r)
12 = (3 * 3 + -1r * 3)
12 = (9 + -3r)

Solving
12 = 9 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
12 + 3r = 9 + -3r + 3r

Combine like terms: -3r + 3r = 0
12 + 3r = 9 + 0
12 + 3r = 9

Add '-12' to each side of the equation.
12 + -12 + 3r = 9 + -12

Combine like terms: 12 + -12 = 0
0 + 3r = 9 + -12
3r = 9 + -12

Combine like terms: 9 + -12 = -3
3r = -3

Divide each side by '3'.
r = -1

Simplifying
r = -1

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