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9u+7=0
We simplify the equation to the form, which is simple to understand
9u+7=0
We move all terms containing u to the left and all other terms to the right.
+9u=0-7
We simplify left and right side of the equation.
+9u=-7
We divide both sides of the equation by 9 to get u.
u=-0.777777777778
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