2-4(r-1)=18-r

Solution for 2-4(r-1)=18-r equation:

Simplifying
2 + -4(r + -1) = 18 + -1r

Reorder the terms:
2 + -4(-1 + r) = 18 + -1r
2 + (-1 * -4 + r * -4) = 18 + -1r
2 + (4 + -4r) = 18 + -1r

Combine like terms: 2 + 4 = 6
6 + -4r = 18 + -1r

Solving
6 + -4r = 18 + -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.
6 + -4r + r = 18 + -1r + r

Combine like terms: -4r + r = -3r
6 + -3r = 18 + -1r + r

Combine like terms: -1r + r = 0
6 + -3r = 18 + 0
6 + -3r = 18

Add '-6' to each side of the equation.
6 + -6 + -3r = 18 + -6

Combine like terms: 6 + -6 = 0
0 + -3r = 18 + -6
-3r = 18 + -6

Combine like terms: 18 + -6 = 12
-3r = 12

Divide each side by '-3'.
r = -4

Simplifying
r = -4