3+4u=-21

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Solution for 3+4u=-21 equation: 


Simplifying
3 + 4u = -21

Solving
3 + 4u = -21

Solving for variable 'u'.

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

Add '-3' to each side of the equation.
3 + -3 + 4u = -21 + -3

Combine like terms: 3 + -3 = 0
0 + 4u = -21 + -3
4u = -21 + -3

Combine like terms: -21 + -3 = -24
4u = -24

Divide each side by '4'.
u = -6

Simplifying
u = -6

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