9=4u-(3+u)

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Solution for 9=4u-(3+u) equation:


Simplifying
9 = 4u + -1(3 + u)
9 = 4u + (3 * -1 + u * -1)
9 = 4u + (-3 + -1u)

Reorder the terms:
9 = -3 + 4u + -1u

Combine like terms: 4u + -1u = 3u
9 = -3 + 3u

Solving
9 = -3 + 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.
9 + -3u = -3 + 3u + -3u

Combine like terms: 3u + -3u = 0
9 + -3u = -3 + 0
9 + -3u = -3

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

Combine like terms: 9 + -9 = 0
0 + -3u = -3 + -9
-3u = -3 + -9

Combine like terms: -3 + -9 = -12
-3u = -12

Divide each side by '-3'.
u = 4

Simplifying
u = 4

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