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400-16u=15u+18+6
We simplify the equation to the form, which is simple to understand
400-16u=15u+18+6
We move all terms containing u to the left and all other terms to the right.
-16u-15u=+18+6-400
We simplify left and right side of the equation.
-31u=-376
We divide both sides of the equation by -31 to get u.
u=12.129032258065
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