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9u-3u-4u+4u-4=8
We simplify the equation to the form, which is simple to understand
9u-3u-4u+4u-4=8
We move all terms containing u to the left and all other terms to the right.
+9u-3u-4u+4u=+8+4
We simplify left and right side of the equation.
+6u=+12
We divide both sides of the equation by 6 to get u.
u=2
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