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-3(u+6)-4u=0
We simplify the equation to the form, which is simple to understand
-3(u+6)-4u=0
Reorder the terms in parentheses
+(-3u-18)-4u=0
Remove unnecessary parentheses
-3u-18-4u=0
We move all terms containing u to the left and all other terms to the right.
-3u-4u=0+18
We simplify left and right side of the equation.
-7u=+18
We divide both sides of the equation by -7 to get u.
u=-2.5714285714286
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