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2.3=u/4-2
We move all terms to the left:
2.3-(u/4-2)=0
We get rid of parentheses
-u/4+2+2.3=0
We multiply all the terms by the denominator
-u+2*4+(2.3)*4=0
We add all the numbers together, and all the variables
-1u+17.2=0
We move all terms containing u to the left, all other terms to the right
-u=-17.2
u=-17.2/-1
u=17+0.2/1
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