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There are many benefits to timing your practice, including:
1) x/(x+2y)> 0 Insufficient
If x is negative and x+2y is negative, then the equation is positive but x+2y < 0; If x is positive and x+2y is positive, then x+2y>0. We do not know the value of y so we have no way of knowing whether x+2y is negative or positive.