139=-u+217

Solution for 139=-u+217 equation:

Simplifying
139 = -1u + 217

Reorder the terms:
139 = 217 + -1u

Solving
139 = 217 + -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.
139 + u = 217 + -1u + u

Combine like terms: -1u + u = 0
139 + u = 217 + 0
139 + u = 217

Add '-139' to each side of the equation.
139 + -139 + u = 217 + -139

Combine like terms: 139 + -139 = 0
0 + u = 217 + -139
u = 217 + -139

Combine like terms: 217 + -139 = 78
u = 78

Simplifying
u = 78