168=-u+42

Solution for 168=-u+42 equation:

Simplifying
168 = -1u + 42

Reorder the terms:
168 = 42 + -1u

Solving
168 = 42 + -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.
168 + u = 42 + -1u + u

Combine like terms: -1u + u = 0
168 + u = 42 + 0
168 + u = 42

Add '-168' to each side of the equation.
168 + -168 + u = 42 + -168

Combine like terms: 168 + -168 = 0
0 + u = 42 + -168
u = 42 + -168

Combine like terms: 42 + -168 = -126
u = -126

Simplifying
u = -126