-6r+3(1-5r)=-123

Solution for -6r+3(1-5r)=-123 equation:

Simplifying
-6r + 3(1 + -5r) = -123
-6r + (1 * 3 + -5r * 3) = -123
-6r + (3 + -15r) = -123

Reorder the terms:
3 + -6r + -15r = -123

Combine like terms: -6r + -15r = -21r
3 + -21r = -123

Solving
3 + -21r = -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 + -21r = -123 + -3

Combine like terms: 3 + -3 = 0
0 + -21r = -123 + -3
-21r = -123 + -3

Combine like terms: -123 + -3 = -126
-21r = -126

Divide each side by '-21'.
r = 6

Simplifying
r = 6