21+3u=72

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Solution for 21+3u=72 equation: 


Simplifying
21 + 3u = 72

Solving
21 + 3u = 72

Solving for variable 'u'.

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

Add '-21' to each side of the equation.
21 + -21 + 3u = 72 + -21

Combine like terms: 21 + -21 = 0
0 + 3u = 72 + -21
3u = 72 + -21

Combine like terms: 72 + -21 = 51
3u = 51

Divide each side by '3'.
u = 17

Simplifying
u = 17

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