-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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