0=7u+21

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Solution for 0=7u+21 equation: 


Simplifying
0 = 7u + 21

Reorder the terms:
0 = 21 + 7u

Solving
0 = 21 + 7u

Solving for variable 'u'.

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

Add '-7u' to each side of the equation.
0 + -7u = 21 + 7u + -7u
Remove the zero:
-7u = 21 + 7u + -7u

Combine like terms: 7u + -7u = 0
-7u = 21 + 0
-7u = 21

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

Simplifying
u = -3

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