3-8u=-9u

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Solution for 3-8u=-9u equation:


Simplifying
3 + -8u = -9u

Solving
3 + -8u = -9u

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '9u' to each side of the equation.
3 + -8u + 9u = -9u + 9u

Combine like terms: -8u + 9u = 1u
3 + 1u = -9u + 9u

Combine like terms: -9u + 9u = 0
3 + 1u = 0

Add '-3' to each side of the equation.
3 + -3 + 1u = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 1u = 0 + -3
1u = 0 + -3

Combine like terms: 0 + -3 = -3
1u = -3

Divide each side by '1'.
u = -3

Simplifying
u = -3

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