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16-9(3-u)+4u=15
We simplify the equation to the form, which is simple to understand
16-9(3-u)+4u=15
Reorder the terms in parentheses
16+(-27+9u)+4u=15
Remove unnecessary parentheses
+16-27+9u+4u=+15
We move all terms containing u to the left and all other terms to the right.
+9u+4u=+15-16+27
We simplify left and right side of the equation.
+13u=+26
We divide both sides of the equation by 13 to get u.
u=2
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