(11)r-(13)r-(11)=9

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Solution for (11)r-(13)r-(11)=9 equation:


Simplifying
(11) * r + -1(13) * r + -1(11) = 9

Multiply -1 * 13
11r + -13r + -1(11) = 9

Multiply -1 * 11
11r + -13r + -11 = 9

Reorder the terms:
-11 + 11r + -13r = 9

Combine like terms: 11r + -13r = -2r
-11 + -2r = 9

Solving
-11 + -2r = 9

Solving for variable 'r'.

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

Add '11' to each side of the equation.
-11 + 11 + -2r = 9 + 11

Combine like terms: -11 + 11 = 0
0 + -2r = 9 + 11
-2r = 9 + 11

Combine like terms: 9 + 11 = 20
-2r = 20

Divide each side by '-2'.
r = -10

Simplifying
r = -10

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