290=87-u

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Solution for 290=87-u equation:


Simplifying
290 = 87 + -1u

Solving
290 = 87 + -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.
290 + u = 87 + -1u + u

Combine like terms: -1u + u = 0
290 + u = 87 + 0
290 + u = 87

Add '-290' to each side of the equation.
290 + -290 + u = 87 + -290

Combine like terms: 290 + -290 = 0
0 + u = 87 + -290
u = 87 + -290

Combine like terms: 87 + -290 = -203
u = -203

Simplifying
u = -203

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