Reduce 15-9+14*11*4*7.

How do you convert 0.4 (4 being repeated) to a fraction?

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Find all the zeros for: ${\displaystyle y=x^3-2x^2-5x+6}$

Solve $$\frac{3}{7}+\frac{1}{7}=$$?

Finding LCM of an expression
$\frac{x}{x^2-8x+7}-\frac{x}{x^2-2x-35}=$$\frac{6x}{(x-7)(x-1)(x+5)}$
I am currently trying to figure out how to solve this problem. I know how they got the denominator but am unsure how they got 6x in the numerator? Can somebody explain this to me?

How do you simplify ${\displaystyle 9^{\frac{3}{2}}}$?