Answer :
3x + y = 25
To solve for 'y' ...
Subtract 3x from each side: y = 25 - 3x
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3x + y = 25
To solve for 'x' ...
Subtract 'y' from each side: 3x = 25 - y
Divide each side by 3 : x = (25 - y) / 3
If you subtract 3x from both sides you get y=25-3x. If you subtract y from both sides you then you divide both sides by three you get x=25-y/3. You can't get a specific answer
