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(2u-4)+(2u-84)=180
We move all terms to the left:
(2u-4)+(2u-84)-(180)=0
We get rid of parentheses
2u+2u-4-84-180=0
We add all the numbers together, and all the variables
4u-268=0
We move all terms containing u to the left, all other terms to the right
4u=268
u=268/4
u=67
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