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90=5u-10
We move all terms to the left:
90-(5u-10)=0
We get rid of parentheses
-5u+10+90=0
We add all the numbers together, and all the variables
-5u+100=0
We move all terms containing u to the left, all other terms to the right
-5u=-100
u=-100/-5
u=+20
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