-9=-1+2r

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Solution for -9=-1+2r equation:


Simplifying
-9 = -1 + 2r

Solving
-9 = -1 + 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.
-9 + -2r = -1 + 2r + -2r

Combine like terms: 2r + -2r = 0
-9 + -2r = -1 + 0
-9 + -2r = -1

Add '9' to each side of the equation.
-9 + 9 + -2r = -1 + 9

Combine like terms: -9 + 9 = 0
0 + -2r = -1 + 9
-2r = -1 + 9

Combine like terms: -1 + 9 = 8
-2r = 8

Divide each side by '-2'.
r = -4

Simplifying
r = -4

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