-21=7u

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Solution for -21=7u equation:


Simplifying
-21 = 7u

Solving
-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.
-21 + -7u = 7u + -7u

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

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

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

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

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

Simplifying
u = -3

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