9-2r=15

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Solution for 9-2r=15 equation: 


Simplifying
9 + -2r = 15

Solving
9 + -2r = 15

Solving for variable 'r'.

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

Add '-9' to each side of the equation.
9 + -9 + -2r = 15 + -9

Combine like terms: 9 + -9 = 0
0 + -2r = 15 + -9
-2r = 15 + -9

Combine like terms: 15 + -9 = 6
-2r = 6

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

Simplifying
r = -3

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