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2u-43+2u-50+2u-21=360
We move all terms to the left:
2u-43+2u-50+2u-21-(360)=0
We add all the numbers together, and all the variables
6u-474=0
We move all terms containing u to the left, all other terms to the right
6u=474
u=474/6
u=79
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