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Divide both sides of the equation by 15
3n=36 Write the equation n=12 Divide each side of the equation by 3 to get the variable alone.
If you mean: 4c = 139 then divide both sides by 4 and so c = 34.75
What you have listed is not an equation but I assume you meant 6w = 42. If you divide both sides by 6 you get w = 7.
The methods vary widely, depending on the type of equation. The general principle is to do the same manipulation on both sides of the equation, trying to isolate the variable (leave the variable alone on one side of the equation). For example, if you have x + 3 = 7 your objective is to have the "x" alone on one side, so you subtract 3 on each side. This results in: x + 3 - 3 = 7 - 3 x + 0 = 4 x = 4 (You don't usually need to write down all these steps; they were included for clarity.)