9=r+12

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Solution for 9=r+12 equation:


Simplifying
9 = r + 12

Reorder the terms:
9 = 12 + r

Solving
9 = 12 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
9 + -1r = 12 + r + -1r

Combine like terms: r + -1r = 0
9 + -1r = 12 + 0
9 + -1r = 12

Add '-9' to each side of the equation.
9 + -9 + -1r = 12 + -9

Combine like terms: 9 + -9 = 0
0 + -1r = 12 + -9
-1r = 12 + -9

Combine like terms: 12 + -9 = 3
-1r = 3

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

Simplifying
r = -3

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