3u-21=9(u+3)

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Solution for 3u-21=9(u+3) equation:


Simplifying
3u + -21 = 9(u + 3)

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

Reorder the terms:
-21 + 3u = 9(3 + u)
-21 + 3u = (3 * 9 + u * 9)
-21 + 3u = (27 + 9u)

Solving
-21 + 3u = 27 + 9u

Solving for variable 'u'.

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

Add '-9u' to each side of the equation.
-21 + 3u + -9u = 27 + 9u + -9u

Combine like terms: 3u + -9u = -6u
-21 + -6u = 27 + 9u + -9u

Combine like terms: 9u + -9u = 0
-21 + -6u = 27 + 0
-21 + -6u = 27

Add '21' to each side of the equation.
-21 + 21 + -6u = 27 + 21

Combine like terms: -21 + 21 = 0
0 + -6u = 27 + 21
-6u = 27 + 21

Combine like terms: 27 + 21 = 48
-6u = 48

Divide each side by '-6'.
u = -8

Simplifying
u = -8

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