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2=u/10-7
We move all terms to the left:
2-(u/10-7)=0
We get rid of parentheses
-u/10+7+2=0
We multiply all the terms by the denominator
-u+7*10+2*10=0
We add all the numbers together, and all the variables
-1u+90=0
We move all terms containing u to the left, all other terms to the right
-u=-90
u=-90/-1
u=+90
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