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u-1+3u-9+2u-15=180
We move all terms to the left:
u-1+3u-9+2u-15-(180)=0
We add all the numbers together, and all the variables
6u-205=0
We move all terms containing u to the left, all other terms to the right
6u=205
u=205/6
u=34+1/6
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