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5u+10(8-u)=65
We simplify the equation to the form, which is simple to understand
5u+10(8-u)=65
Reorder the terms in parentheses
5u+(+80-10u)=65
Remove unnecessary parentheses
+5u+80-10u=+65
We move all terms containing u to the left and all other terms to the right.
+5u-10u=+65-80
We simplify left and right side of the equation.
-5u=-15
We divide both sides of the equation by -5 to get u.
u=3
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