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8=u/31.25+3
We move all terms to the left:
8-(u/31.25+3)=0
We get rid of parentheses
-u/31.25-3+8=0
We multiply all the terms by the denominator
-u-3*31.25+8*31.25=0
We add all the numbers together, and all the variables
-1u+156.25=0
We move all terms containing u to the left, all other terms to the right
-u=-156.25
u=-156.25/-1
u=156+0.25/1
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