6u-21=-9

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Solution for 6u-21=-9 equation: 


Simplifying
6u + -21 = -9

Reorder the terms:
-21 + 6u = -9

Solving
-21 + 6u = -9

Solving for variable 'u'.

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

Add '21' to each side of the equation.
-21 + 21 + 6u = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 6u = -9 + 21
6u = -9 + 21

Combine like terms: -9 + 21 = 12
6u = 12

Divide each side by '6'.
u = 2

Simplifying
u = 2

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