3r+3(r+15)=

Solution for 3r+3(r+15)= equation:

Simplifying
3r + 3(r + 15) = 0

Reorder the terms:
3r + 3(15 + r) = 0
3r + (15 * 3 + r * 3) = 0
3r + (45 + 3r) = 0

Reorder the terms:
45 + 3r + 3r = 0

Combine like terms: 3r + 3r = 6r
45 + 6r = 0

Solving
45 + 6r = 0

Solving for variable 'r'.

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

Add '-45' to each side of the equation.
45 + -45 + 6r = 0 + -45

Combine like terms: 45 + -45 = 0
0 + 6r = 0 + -45
6r = 0 + -45

Combine like terms: 0 + -45 = -45
6r = -45

Divide each side by '6'.
r = -7.5

Simplifying
r = -7.5