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18u-15u-84=54
We simplify the equation to the form, which is simple to understand
18u-15u-84=54
We move all terms containing u to the left and all other terms to the right.
+18u-15u=+54+84
We simplify left and right side of the equation.
+3u=+138
We divide both sides of the equation by 3 to get u.
u=46
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