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6.2=4u-19.4
We move all terms to the left:
6.2-(4u-19.4)=0
We get rid of parentheses
-4u+19.4+6.2=0
We add all the numbers together, and all the variables
-4u+25.6=0
We move all terms containing u to the left, all other terms to the right
-4u=-25.6
u=-25.6/-4
u=6+1/2.5
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