21=-3u+6(u+3)

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Solution for 21=-3u+6(u+3) equation:


Simplifying
21 = -3u + 6(u + 3)

Reorder the terms:
21 = -3u + 6(3 + u)
21 = -3u + (3 * 6 + u * 6)
21 = -3u + (18 + 6u)

Reorder the terms:
21 = 18 + -3u + 6u

Combine like terms: -3u + 6u = 3u
21 = 18 + 3u

Solving
21 = 18 + 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
21 + -3u = 18 + 3u + -3u

Combine like terms: 3u + -3u = 0
21 + -3u = 18 + 0
21 + -3u = 18

Add '-21' to each side of the equation.
21 + -21 + -3u = 18 + -21

Combine like terms: 21 + -21 = 0
0 + -3u = 18 + -21
-3u = 18 + -21

Combine like terms: 18 + -21 = -3
-3u = -3

Divide each side by '-3'.
u = 1

Simplifying
u = 1

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