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8-5u=8u-31
We simplify the equation to the form, which is simple to understand
8-5u=8u-31
We move all terms containing u to the left and all other terms to the right.
-5u-8u=-31-8
We simplify left and right side of the equation.
-13u=-39
We divide both sides of the equation by -13 to get u.
u=3
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