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(57+x)/5=15
We move all terms to the left:
(57+x)/5-(15)=0
We add all the numbers together, and all the variables
(x+57)/5-15=0
We multiply all the terms by the denominator
(x+57)-15*5=0
We add all the numbers together, and all the variables
(x+57)-75=0
We get rid of parentheses
x+57-75=0
We add all the numbers together, and all the variables
x-18=0
We move all terms containing x to the left, all other terms to the right
x=18
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