r-1=8r-8

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


Simplifying
r + -1 = 8r + -8

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

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

Solving
-1 + r = -8 + 8r

Solving for variable 'r'.

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

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

Combine like terms: r + -8r = -7r
-1 + -7r = -8 + 8r + -8r

Combine like terms: 8r + -8r = 0
-1 + -7r = -8 + 0
-1 + -7r = -8

Add '1' to each side of the equation.
-1 + 1 + -7r = -8 + 1

Combine like terms: -1 + 1 = 0
0 + -7r = -8 + 1
-7r = -8 + 1

Combine like terms: -8 + 1 = -7
-7r = -7

Divide each side by '-7'.
r = 1

Simplifying
r = 1

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