3(3x-1)2=21

Solution for 3(3x-1)2=21 equation:

Simplifying
3(3x + -1) * 2 = 21

Reorder the terms:
3(-1 + 3x) * 2 = 21

Reorder the terms for easier multiplication:
3 * 2(-1 + 3x) = 21

Multiply 3 * 2
6(-1 + 3x) = 21
(-1 * 6 + 3x * 6) = 21
(-6 + 18x) = 21

Solving
-6 + 18x = 21

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 18x = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 18x = 21 + 6
18x = 21 + 6

Combine like terms: 21 + 6 = 27
18x = 27

Divide each side by '18'.
x = 1.5

Simplifying
x = 1.5