Solve w - 2w 1/2 - 15 = 0
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Treat the fraction as any other constant, except if your equation is: $\displaystyle w-2w\frac{1}{2}-15=0$ then it's false since: $\displaystyle w-2w\frac{1}{2}-15=0$ $\displaystyle w-w-15=0$ $\displaystyle -15=0$ which is obviously not true.
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