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28=x/7+31
We move all terms to the left:
28-(x/7+31)=0
We get rid of parentheses
-x/7-31+28=0
We multiply all the terms by the denominator
-x-31*7+28*7=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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