(3r*3-3r)(-6r*3-3r)=

Solution for (3r*3-3r)(-6r*3-3r)= equation:

Simplifying
(3r * 3 + -3r)(-6r * 3 + -3r) = 0

Reorder the terms for easier multiplication:
(3 * 3r + -3r)(-6r * 3 + -3r) = 0

Multiply 3 * 3
(9r + -3r)(-6r * 3 + -3r) = 0

Combine like terms: 9r + -3r = 6r
(6r)(-6r * 3 + -3r) = 0

Remove parenthesis around (6r)
6r(-6r * 3 + -3r) = 0

Reorder the terms for easier multiplication:
6r(-6 * 3r + -3r) = 0

Multiply -6 * 3
6r(-18r + -3r) = 0

Combine like terms: -18r + -3r = -21r
6r(-21r) = 0

Remove parenthesis around (-21r)
6r * -21r = 0

Reorder the terms for easier multiplication:
6 * -21r * r = 0

Multiply 6 * -21
-126r * r = 0

Multiply r * r
-126r2 = 0

Solving
-126r2 = 0

Solving for variable 'r'.

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

Divide each side by '-126'.
r2 = 0

Simplifying
r2 = 0

Take the square root of each side:
r = {0}