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20u-16u+6=-6
We simplify the equation to the form, which is simple to understand
20u-16u+6=-6
We move all terms containing u to the left and all other terms to the right.
+20u-16u=-6-6
We simplify left and right side of the equation.
+4u=-12
We divide both sides of the equation by 4 to get u.
u=-3
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