Verified Answer :

Solution for (-4z^2-11u)-5z^2=
Simplifying
(-4z2 + -11u) + -5z2 = 0

 Reorder the terms:
(-11u + -4z2) + -5z2 = 0
  Remove parenthesis around (-11u + -4z2)
-11u + -4z2 + -5z2 = 0
  Combine like terms: -4z2 + -5z2 = -9z2
-11u + -9z2 = 0

Solving
-11u + -9z2 = 0

Solving for variable 'u'.
 Add '9z2' to each side of the equation.
-11u + -9z2 + 9z2 = 0 + 9z2

Combine like terms: -9z2 + 9z2 = 0
-11u + 0 = 0 + 9z2
-11u = 0 + 9z2
 Remove the zero:
-11u = 9z2

Divide each side by '-11'.
u = -0.8181818182z2

Simplifying
u = -0.8181818182z2