9=-12+6*r

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Solution for 9=-12+6*r equation:


Simplifying
9 = -12 + 6r

Solving
9 = -12 + 6r

Solving for variable 'r'.

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

Add '-6r' to each side of the equation.
9 + -6r = -12 + 6r + -6r

Combine like terms: 6r + -6r = 0
9 + -6r = -12 + 0
9 + -6r = -12

Add '-9' to each side of the equation.
9 + -9 + -6r = -12 + -9

Combine like terms: 9 + -9 = 0
0 + -6r = -12 + -9
-6r = -12 + -9

Combine like terms: -12 + -9 = -21
-6r = -21

Divide each side by '-6'.
r = 3.5

Simplifying
r = 3.5

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