3=7(-2u)-6u

Solution for 3=7(-2u)-6u equation:

Simplifying
3 = 7(-2u) + -6u

Remove parenthesis around (-2u)
3 = 7 * -2u + -6u

Multiply 7 * -2
3 = -14u + -6u

Combine like terms: -14u + -6u = -20u
3 = -20u

Solving
3 = -20u

Solving for variable 'u'.

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

Add '20u' to each side of the equation.
3 + 20u = -20u + 20u

Combine like terms: -20u + 20u = 0
3 + 20u = 0

Add '-3' to each side of the equation.
3 + -3 + 20u = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 20u = 0 + -3
20u = 0 + -3

Combine like terms: 0 + -3 = -3
20u = -3

Divide each side by '20'.
u = -0.15

Simplifying
u = -0.15