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What is the reason behind simplifying a fraction? please explain, thank you? How can rates be converted to unit rates? How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help? Solve for x: log base{5}(x+6)- log base{5}(x-5)=1? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x?