2x(x+6x)=20

Solution for 2x(x+6x)=20 equation:

Simplifying
2x(x + 6x) = 20

Combine like terms: x + 6x = 7x
2x(7x) = 20

Remove parenthesis around (7x)
2x * 7x = 20

Reorder the terms for easier multiplication:
2 * 7x * x = 20

Multiply 2 * 7
14x * x = 20

Multiply x * x
14x2 = 20

Solving
14x2 = 20

Solving for variable 'x'.

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

Divide each side by '14'.
x2 = 1.428571429

Simplifying
x2 = 1.428571429

Take the square root of each side:
x = {-1.19522861, 1.19522861}