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16-12=-7u+3u
We simplify the equation to the form, which is simple to understand
16-12=-7u+3u
We move all terms containing u to the left and all other terms to the right.
+7u-3u=-16+12
We simplify left and right side of the equation.
+4u=-4
We divide both sides of the equation by 4 to get u.
u=-1
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