3(u+7)=-7u-9

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Solution for 3(u+7)=-7u-9 equation:


Simplifying
3(u + 7) = -7u + -9

Reorder the terms:
3(7 + u) = -7u + -9
(7 * 3 + u * 3) = -7u + -9
(21 + 3u) = -7u + -9

Reorder the terms:
21 + 3u = -9 + -7u

Solving
21 + 3u = -9 + -7u

Solving for variable 'u'.

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

Add '7u' to each side of the equation.
21 + 3u + 7u = -9 + -7u + 7u

Combine like terms: 3u + 7u = 10u
21 + 10u = -9 + -7u + 7u

Combine like terms: -7u + 7u = 0
21 + 10u = -9 + 0
21 + 10u = -9

Add '-21' to each side of the equation.
21 + -21 + 10u = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 10u = -9 + -21
10u = -9 + -21

Combine like terms: -9 + -21 = -30
10u = -30

Divide each side by '10'.
u = -3

Simplifying
u = -3

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