3(5r+5)-12=

Solution for 3(5r+5)-12= equation:

Simplifying
3(5r + 5) + -12 = 0

Reorder the terms:
3(5 + 5r) + -12 = 0
(5 * 3 + 5r * 3) + -12 = 0
(15 + 15r) + -12 = 0

Reorder the terms:
15 + -12 + 15r = 0

Combine like terms: 15 + -12 = 3
3 + 15r = 0

Solving
3 + 15r = 0

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 = 0 + -3

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

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

Divide each side by '15'.
r = -0.2

Simplifying
r = -0.2