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23.4=-2.2+4u
We move all terms to the left:
23.4-(-2.2+4u)=0
We add all the numbers together, and all the variables
-(4u-2.2)+23.4=0
We get rid of parentheses
-4u+2.2+23.4=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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