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2u-18+2u-20+2u-10=180
We move all terms to the left:
2u-18+2u-20+2u-10-(180)=0
We add all the numbers together, and all the variables
6u-228=0
We move all terms containing u to the left, all other terms to the right
6u=228
u=228/6
u=38
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