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(5u+6)(3-9)=0
We add all the numbers together, and all the variables
(5u+6)(-6)=0
We multiply parentheses ..
(-30u-36)=0
We get rid of parentheses
-30u-36=0
We move all terms containing u to the left, all other terms to the right
-30u=36
u=36/-30
u=-1+1/5
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