21=3(u+3)-8u

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


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

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

Combine like terms: 3u + -8u = -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 = -12
5u = -12

Divide each side by '5'.
u = -2.4

Simplifying
u = -2.4

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