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55+80+82+13u=360
We simplify the equation to the form, which is simple to understand
55+80+82+13u=360
We move all terms containing u to the left and all other terms to the right.
+13u=+360-55-80-82
We simplify left and right side of the equation.
+13u=+143
We divide both sides of the equation by 13 to get u.
u=11
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