21=-7*u+4(u+6)

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Solution for 21=-7*u+4(u+6) equation:


Simplifying
21 = -7u + 4(u + 6)

Reorder the terms:
21 = -7u + 4(6 + u)
21 = -7u + (6 * 4 + u * 4)
21 = -7u + (24 + 4u)

Reorder the terms:
21 = 24 + -7u + 4u

Combine like terms: -7u + 4u = -3u
21 = 24 + -3u

Solving
21 = 24 + -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 = 24 + -3u + 3u

Combine like terms: -3u + 3u = 0
21 + 3u = 24 + 0
21 + 3u = 24

Add '-21' to each side of the equation.
21 + -21 + 3u = 24 + -21

Combine like terms: 21 + -21 = 0
0 + 3u = 24 + -21
3u = 24 + -21

Combine like terms: 24 + -21 = 3
3u = 3

Divide each side by '3'.
u = 1

Simplifying
u = 1

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