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10+18+u=117
We simplify the equation to the form, which is simple to understand
10+18+u=117
We move all terms containing u to the left and all other terms to the right.
+1u=+117-10-18
We simplify left and right side of the equation.
+1u=+89
We divide both sides of the equation by 1 to get u.
u=89
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