-9=3+4u

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Solution for -9=3+4u equation:


Simplifying
-9 = 3 + 4u

Solving
-9 = 3 + 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.
-9 + -4u = 3 + 4u + -4u

Combine like terms: 4u + -4u = 0
-9 + -4u = 3 + 0
-9 + -4u = 3

Add '9' to each side of the equation.
-9 + 9 + -4u = 3 + 9

Combine like terms: -9 + 9 = 0
0 + -4u = 3 + 9
-4u = 3 + 9

Combine like terms: 3 + 9 = 12
-4u = 12

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

Simplifying
u = -3

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