-3(u+7)=-9u-15

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Solution for -3(u+7)=-9u-15 equation:


Simplifying
-3(u + 7) = -9u + -15

Reorder the terms:
-3(7 + u) = -9u + -15
(7 * -3 + u * -3) = -9u + -15
(-21 + -3u) = -9u + -15

Reorder the terms:
-21 + -3u = -15 + -9u

Solving
-21 + -3u = -15 + -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 = -15 + -9u + 9u

Combine like terms: -3u + 9u = 6u
-21 + 6u = -15 + -9u + 9u

Combine like terms: -9u + 9u = 0
-21 + 6u = -15 + 0
-21 + 6u = -15

Add '21' to each side of the equation.
-21 + 21 + 6u = -15 + 21

Combine like terms: -21 + 21 = 0
0 + 6u = -15 + 21
6u = -15 + 21

Combine like terms: -15 + 21 = 6
6u = 6

Divide each side by '6'.
u = 1

Simplifying
u = 1

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