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15u-8u+3u-5u-2u=6
We move all terms to the left:
15u-8u+3u-5u-2u-(6)=0
We add all the numbers together, and all the variables
3u-6=0
We move all terms containing u to the left, all other terms to the right
3u=6
u=6/3
u=2
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