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25=7+u/3
We move all terms to the left:
25-(7+u/3)=0
We add all the numbers together, and all the variables
-(u/3+7)+25=0
We get rid of parentheses
-u/3-7+25=0
We multiply all the terms by the denominator
-u-7*3+25*3=0
We add all the numbers together, and all the variables
-1u+54=0
We move all terms containing u to the left, all other terms to the right
-u=-54
u=-54/-1
u=+54
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