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-4u+u=-1-17
We simplify the equation to the form, which is simple to understand
-4u+u=-1-17
We move all terms containing u to the left and all other terms to the right.
-4u+1u=-1-17
We simplify left and right side of the equation.
-3u=-18
We divide both sides of the equation by -3 to get u.
u=6
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