-21=7+4u

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Solution for -21=7+4u equation:


Simplifying
-21 = 7 + 4u

Solving
-21 = 7 + 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
-21 + -4u = 7 + 4u + -4u

Combine like terms: 4u + -4u = 0
-21 + -4u = 7 + 0
-21 + -4u = 7

Add '21' to each side of the equation.
-21 + 21 + -4u = 7 + 21

Combine like terms: -21 + 21 = 0
0 + -4u = 7 + 21
-4u = 7 + 21

Combine like terms: 7 + 21 = 28
-4u = 28

Divide each side by '-4'.
u = -7

Simplifying
u = -7

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