9u-39=-4u

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Solution for 9u-39=-4u equation:


Simplifying
9u + -39 = -4u

Reorder the terms:
-39 + 9u = -4u

Solving
-39 + 9u = -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
-39 + 9u + 4u = -4u + 4u

Combine like terms: 9u + 4u = 13u
-39 + 13u = -4u + 4u

Combine like terms: -4u + 4u = 0
-39 + 13u = 0

Add '39' to each side of the equation.
-39 + 39 + 13u = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 13u = 0 + 39
13u = 0 + 39

Combine like terms: 0 + 39 = 39
13u = 39

Divide each side by '13'.
u = 3

Simplifying
u = 3

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