-1=-2r+8

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Solution for -1=-2r+8 equation:


Simplifying
-1 = -2r + 8

Reorder the terms:
-1 = 8 + -2r

Solving
-1 = 8 + -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.
-1 + 2r = 8 + -2r + 2r

Combine like terms: -2r + 2r = 0
-1 + 2r = 8 + 0
-1 + 2r = 8

Add '1' to each side of the equation.
-1 + 1 + 2r = 8 + 1

Combine like terms: -1 + 1 = 0
0 + 2r = 8 + 1
2r = 8 + 1

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

Divide each side by '2'.
r = 4.5

Simplifying
r = 4.5

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