8r-1=-r-10

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Solution for 8r-1=-r-10 equation:


Simplifying
8r + -1 = -1r + -10

Reorder the terms:
-1 + 8r = -1r + -10

Reorder the terms:
-1 + 8r = -10 + -1r

Solving
-1 + 8r = -10 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-1 + 8r + r = -10 + -1r + r

Combine like terms: 8r + r = 9r
-1 + 9r = -10 + -1r + r

Combine like terms: -1r + r = 0
-1 + 9r = -10 + 0
-1 + 9r = -10

Add '1' to each side of the equation.
-1 + 1 + 9r = -10 + 1

Combine like terms: -1 + 1 = 0
0 + 9r = -10 + 1
9r = -10 + 1

Combine like terms: -10 + 1 = -9
9r = -9

Divide each side by '9'.
r = -1

Simplifying
r = -1

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