21+7u=56

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Solution for 21+7u=56 equation: 


Simplifying
21 + 7u = 56

Solving
21 + 7u = 56

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 + 7u = 56 + -21

Combine like terms: 21 + -21 = 0
0 + 7u = 56 + -21
7u = 56 + -21

Combine like terms: 56 + -21 = 35
7u = 35

Divide each side by '7'.
u = 5

Simplifying
u = 5

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