-18=3(r+-2)

Solution for -18=3(r+-2) equation:

Simplifying
-18 = 3(r + -2)

Reorder the terms:
-18 = 3(-2 + r)
-18 = (-2 * 3 + r * 3)
-18 = (-6 + 3r)

Solving
-18 = -6 + 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.
-18 + -3r = -6 + 3r + -3r

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

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

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

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

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

Simplifying
r = -4