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4=u/10+2
We move all terms to the left:
4-(u/10+2)=0
We get rid of parentheses
-u/10-2+4=0
We multiply all the terms by the denominator
-u-2*10+4*10=0
We add all the numbers together, and all the variables
-1u+20=0
We move all terms containing u to the left, all other terms to the right
-u=-20
u=-20/-1
u=+20
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