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 = 18
4u = 18

Divide each side by '4'.
u = 4.5

Simplifying
u = 4.5

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