-21=-8u+3(u+3)

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Solution for -21=-8u+3(u+3) equation:


Simplifying
-21 = -8u + 3(u + 3)

Reorder the terms:
-21 = -8u + 3(3 + u)
-21 = -8u + (3 * 3 + u * 3)
-21 = -8u + (9 + 3u)

Reorder the terms:
-21 = 9 + -8u + 3u

Combine like terms: -8u + 3u = -5u
-21 = 9 + -5u

Solving
-21 = 9 + -5u

Solving for variable 'u'.

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

Add '5u' to each side of the equation.
-21 + 5u = 9 + -5u + 5u

Combine like terms: -5u + 5u = 0
-21 + 5u = 9 + 0
-21 + 5u = 9

Add '21' to each side of the equation.
-21 + 21 + 5u = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 5u = 9 + 21
5u = 9 + 21

Combine like terms: 9 + 21 = 30
5u = 30

Divide each side by '5'.
u = 6

Simplifying
u = 6

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