8u-u=-21

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Solution for 8u-u=-21 equation: 


Simplifying
8u + -1u = -21

Combine like terms: 8u + -1u = 7u
7u = -21

Solving
7u = -21

Solving for variable 'u'.

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

Divide each side by '7'.
u = -3

Simplifying
u = -3

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