217=77-u

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Solution for 217=77-u equation:


Simplifying
217 = 77 + -1u

Solving
217 = 77 + -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.
217 + u = 77 + -1u + u

Combine like terms: -1u + u = 0
217 + u = 77 + 0
217 + u = 77

Add '-217' to each side of the equation.
217 + -217 + u = 77 + -217

Combine like terms: 217 + -217 = 0
0 + u = 77 + -217
u = 77 + -217

Combine like terms: 77 + -217 = -140
u = -140

Simplifying
u = -140

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