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(5+u)10=90
We move all terms to the left:
(5+u)10-(90)=0
We add all the numbers together, and all the variables
(u+5)10-90=0
We multiply parentheses
10u+50-90=0
We add all the numbers together, and all the variables
10u-40=0
We move all terms containing u to the left, all other terms to the right
10u=40
u=40/10
u=4
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