-9-3u=7-u

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Solution for -9-3u=7-u equation:


Simplifying
-9 + -3u = 7 + -1u

Solving
-9 + -3u = 7 + -1u

Solving for variable 'u'.

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

Add 'u' to each side of the equation.
-9 + -3u + u = 7 + -1u + u

Combine like terms: -3u + u = -2u
-9 + -2u = 7 + -1u + u

Combine like terms: -1u + u = 0
-9 + -2u = 7 + 0
-9 + -2u = 7

Add '9' to each side of the equation.
-9 + 9 + -2u = 7 + 9

Combine like terms: -9 + 9 = 0
0 + -2u = 7 + 9
-2u = 7 + 9

Combine like terms: 7 + 9 = 16
-2u = 16

Divide each side by '-2'.
u = -8

Simplifying
u = -8

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