Question

What is the answer to -5/6+x/6=1/x

Answer 1

$-5/6+x/6=1/x\Leftrightarrow x^2-5x-6=0$

$\Delta=25+24=7^2$ hence the answer is $\frac{5\pm7}{2}=\left\lbrace-1,6\right\rbrace$

Answer 2

$-\dfrac{5}{6}+\dfrac{x}{6}=\dfrac{1}{x}|\cdot6x\qquad(x \not=0)\\ -5x+x^2=6\\ x^2-5x-6=0\\ x^2+x-6x-6=0\\ x(x+1)-6(x+1)=0\\ (x-6)(x+1)=0\\ x=6 \vee x=-1$