(u-7)*7=21

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


Simplifying
(u + -7) * 7 = 21

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

Reorder the terms for easier multiplication:
7(-7 + u) = 21
(-7 * 7 + u * 7) = 21
(-49 + 7u) = 21

Solving
-49 + 7u = 21

Solving for variable 'u'.

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

Add '49' to each side of the equation.
-49 + 49 + 7u = 21 + 49

Combine like terms: -49 + 49 = 0
0 + 7u = 21 + 49
7u = 21 + 49

Combine like terms: 21 + 49 = 70
7u = 70

Divide each side by '7'.
u = 10

Simplifying
u = 10

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