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-3/8=u-7/8
We move all terms to the left:
-3/8-(u-7/8)=0
We add all the numbers together, and all the variables
-(+u-7/8)-3/8=0
We get rid of parentheses
-u+7/8-3/8=0
We multiply all the terms by the denominator
-u*8+7-3=0
We add all the numbers together, and all the variables
-u*8+4=0
Wy multiply elements
-8u+4=0
We move all terms containing u to the left, all other terms to the right
-8u=-4
u=-4/-8
u=1/2
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