171=-u+78

Solution for 171=-u+78 equation:

Simplifying
171 = -1u + 78

Reorder the terms:
171 = 78 + -1u

Solving
171 = 78 + -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.
171 + u = 78 + -1u + u

Combine like terms: -1u + u = 0
171 + u = 78 + 0
171 + u = 78

Add '-171' to each side of the equation.
171 + -171 + u = 78 + -171

Combine like terms: 171 + -171 = 0
0 + u = 78 + -171
u = 78 + -171

Combine like terms: 78 + -171 = -93
u = -93

Simplifying
u = -93