91=-2r

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Solution for 91=-2r equation:


Simplifying
91 = -2r

Solving
91 = -2r

Solving for variable 'r'.

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

Add '2r' to each side of the equation.
91 + 2r = -2r + 2r

Combine like terms: -2r + 2r = 0
91 + 2r = 0

Add '-91' to each side of the equation.
91 + -91 + 2r = 0 + -91

Combine like terms: 91 + -91 = 0
0 + 2r = 0 + -91
2r = 0 + -91

Combine like terms: 0 + -91 = -91
2r = -91

Divide each side by '2'.
r = -45.5

Simplifying
r = -45.5

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