<PRE><B>Question 168853</B>
{{{x/4+x/5=9}}} Start with the given equation.



{{{20(x/cross(4)+x/cross(5))=20(9)}}} Multiply both sides by the LCD {{{20}}} to clear any fractions.



{{{5x+4x=180}}} Distribute and multiply.



{{{9x=180}}} Combine like terms on the left side.



{{{x=(180)/(9)}}} Divide both sides by {{{9}}} to isolate {{{x}}}.



{{{x=20}}} Reduce.



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Answer:


So the answer is {{{x=20}}} </PRE>