33=172-u

Solution for 33=172-u equation:

Simplifying
33 = 172 + -1u

Solving
33 = 172 + -1u

Solving for variable 'u'.

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

Add 'u' to each side of the equation.
33 + u = 172 + -1u + u

Combine like terms: -1u + u = 0
33 + u = 172 + 0
33 + u = 172

Add '-33' to each side of the equation.
33 + -33 + u = 172 + -33

Combine like terms: 33 + -33 = 0
0 + u = 172 + -33
u = 172 + -33

Combine like terms: 172 + -33 = 139
u = 139

Simplifying
u = 139