(U-8)7=21

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Solution for (U-8)7=21 equation:


Simplifying
(U + -8) * 7 = 21

Reorder the terms:
(-8 + U) * 7 = 21

Reorder the terms for easier multiplication:
7(-8 + U) = 21
(-8 * 7 + U * 7) = 21
(-56 + 7U) = 21

Solving
-56 + 7U = 21

Solving for variable 'U'.

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

Add '56' to each side of the equation.
-56 + 56 + 7U = 21 + 56

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

Combine like terms: 21 + 56 = 77
7U = 77

Divide each side by '7'.
U = 11

Simplifying
U = 11

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