(7u+6u)(7u-6u)=

Solution for (7u+6u)(7u-6u)= equation:

Simplifying
(7u + 6u)(7u + -6u) = 0

Combine like terms: 7u + 6u = 13u
(13u)(7u + -6u) = 0

Remove parenthesis around (13u)
13u(7u + -6u) = 0

Combine like terms: 7u + -6u = 1u
13u(1u) = 0

Remove parenthesis around (1u)
13u * 1u = 0

Reorder the terms for easier multiplication:
13 * 1u * u = 0

Multiply 13 * 1
13u * u = 0

Multiply u * u
13u2 = 0

Solving
13u2 = 0

Solving for variable 'u'.

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

Divide each side by '13'.
u2 = 0

Simplifying
u2 = 0

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