3r-1=r-8

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Solution for 3r-1=r-8 equation:


Simplifying
3r + -1 = r + -8

Reorder the terms:
-1 + 3r = r + -8

Reorder the terms:
-1 + 3r = -8 + r

Solving
-1 + 3r = -8 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-1 + 3r + -1r = -8 + r + -1r

Combine like terms: 3r + -1r = 2r
-1 + 2r = -8 + r + -1r

Combine like terms: r + -1r = 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 = -7
2r = -7

Divide each side by '2'.
r = -3.5

Simplifying
r = -3.5

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