-1=-8(r+8)-r

Solution for -1=-8(r+8)-r equation:

Simplifying
-1 = -8(r + 8) + -1r

Reorder the terms:
-1 = -8(8 + r) + -1r
-1 = (8 * -8 + r * -8) + -1r
-1 = (-64 + -8r) + -1r

Combine like terms: -8r + -1r = -9r
-1 = -64 + -9r

Solving
-1 = -64 + -9r

Solving for variable 'r'.

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

Add '9r' to each side of the equation.
-1 + 9r = -64 + -9r + 9r

Combine like terms: -9r + 9r = 0
-1 + 9r = -64 + 0
-1 + 9r = -64

Add '1' to each side of the equation.
-1 + 1 + 9r = -64 + 1

Combine like terms: -1 + 1 = 0
0 + 9r = -64 + 1
9r = -64 + 1

Combine like terms: -64 + 1 = -63
9r = -63

Divide each side by '9'.
r = -7

Simplifying
r = -7