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-4u=5u-9u-5
We simplify the equation to the form, which is simple to understand
-4u=5u-9u-5
We move all terms containing u to the left and all other terms to the right.
-4u-5u+9u=-5
We simplify left and right side of the equation.
u=-5
0=-5
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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