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-4(u-90)=8
We move all terms to the left:
-4(u-90)-(8)=0
We multiply parentheses
-4u+360-8=0
We add all the numbers together, and all the variables
-4u+352=0
We move all terms containing u to the left, all other terms to the right
-4u=-352
u=-352/-4
u=+88
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