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-6u +3u=0
We simplify the equation to the form, which is simple to understand
-6u+3u=0
We move all terms containing u to the left and all other terms to the right.
-6u+3u=0
We simplify left and right side of the equation.
-3u=0
We divide both sides of the equation by -3 to get u.
u=-0
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