-1+r=3(r-1)

Solution for -1+r=3(r-1) equation:

Simplifying
-1 + r = 3(r + -1)

Reorder the terms:
-1 + r = 3(-1 + r)
-1 + r = (-1 * 3 + r * 3)
-1 + r = (-3 + 3r)

Solving
-1 + r = -3 + 3r

Solving for variable 'r'.

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

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

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

Combine like terms: 3r + -3r = 0
-1 + -2r = -3 + 0
-1 + -2r = -3

Add '1' to each side of the equation.
-1 + 1 + -2r = -3 + 1

Combine like terms: -1 + 1 = 0
0 + -2r = -3 + 1
-2r = -3 + 1

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

Divide each side by '-2'.
r = 1

Simplifying
r = 1