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0=u+15+4u
We simplify the equation to the form, which is simple to understand
0=u+15+4u
We move all terms containing u to the left and all other terms to the right.
-1u-4u=+15-0
We simplify left and right side of the equation.
-5u=+15
We divide both sides of the equation by -5 to get u.
u=-3
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