7(u-4)=21

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Solution for 7(u-4)=21 equation: 


Simplifying
7(u + -4) = 21

Reorder the terms:
7(-4 + u) = 21
(-4 * 7 + u * 7) = 21
(-28 + 7u) = 21

Solving
-28 + 7u = 21

Solving for variable 'u'.

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

Add '28' to each side of the equation.
-28 + 28 + 7u = 21 + 28

Combine like terms: -28 + 28 = 0
0 + 7u = 21 + 28
7u = 21 + 28

Combine like terms: 21 + 28 = 49
7u = 49

Divide each side by '7'.
u = 7

Simplifying
u = 7

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