5(1-3r)-2=123

Solution for 5(1-3r)-2=123 equation:

Simplifying
5(1 + -3r) + -2 = 123
(1 * 5 + -3r * 5) + -2 = 123
(5 + -15r) + -2 = 123

Reorder the terms:
5 + -2 + -15r = 123

Combine like terms: 5 + -2 = 3
3 + -15r = 123

Solving
3 + -15r = 123

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + -15r = 123 + -3

Combine like terms: 3 + -3 = 0
0 + -15r = 123 + -3
-15r = 123 + -3

Combine like terms: 123 + -3 = 120
-15r = 120

Divide each side by '-15'.
r = -8

Simplifying
r = -8