6+3(8r-9)=-15

Solution for 6+3(8r-9)=-15 equation:

Simplifying
6 + 3(8r + -9) = -15

Reorder the terms:
6 + 3(-9 + 8r) = -15
6 + (-9 * 3 + 8r * 3) = -15
6 + (-27 + 24r) = -15

Combine like terms: 6 + -27 = -21
-21 + 24r = -15

Solving
-21 + 24r = -15

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 24r = -15 + 21

Combine like terms: -21 + 21 = 0
0 + 24r = -15 + 21
24r = -15 + 21

Combine like terms: -15 + 21 = 6
24r = 6

Divide each side by '24'.
r = 0.25

Simplifying
r = 0.25