-13u-(-8u)+(-8u)-(-11u)=-20

Solution for -13u-(-8u)+(-8u)-(-11u)=-20 equation:

Simplifying
-13u + -1(-8u) + (-8u) + -1(-11u) = -20

Remove parenthesis around (-8u)
-13u + -1 * -8u + (-8u) + -1(-11u) = -20

Multiply -1 * -8
-13u + 8u + (-8u) + -1(-11u) = -20

Remove parenthesis around (-11u)
-13u + 8u + (-8u) + -1 * -11u = -20

Multiply -1 * -11
-13u + 8u + (-8u) + 11u = -20

Combine like terms: -13u + 8u = -5u
-5u + (-8u) + 11u = -20

Combine like terms: -5u + (-8u) = -13u
-13u + 11u = -20

Combine like terms: -13u + 11u = -2u
-2u = -20

Solving
-2u = -20

Solving for variable 'u'.

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

Divide each side by '-2'.
u = 10

Simplifying
u = 10