2.6=x(3x)

Solution for 2.6=x(3x) equation:

Simplifying
2.6 = x(3x)

Remove parenthesis around (3x)
2.6 = x * 3x

Reorder the terms for easier multiplication:
2.6 = 3x * x

Multiply x * x
2.6 = 3x2

Solving
2.6 = 3x2

Solving for variable 'x'.

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

Add '-3x2' to each side of the equation.
2.6 + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
2.6 + -3x2 = 0

Add '-2.6' to each side of the equation.
2.6 + -2.6 + -3x2 = 0 + -2.6

Combine like terms: 2.6 + -2.6 = 0.0
0.0 + -3x2 = 0 + -2.6
-3x2 = 0 + -2.6

Combine like terms: 0 + -2.6 = -2.6
-3x2 = -2.6

Divide each side by '-3'.
x2 = 0.8666666667

Simplifying
x2 = 0.8666666667

Take the square root of each side:
x = {-0.930949336, 0.930949336}