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10u+3u+2u+3u-14u=20
We move all terms to the left:
10u+3u+2u+3u-14u-(20)=0
We add all the numbers together, and all the variables
4u-20=0
We move all terms containing u to the left, all other terms to the right
4u=20
u=20/4
u=5
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