Question 225158
Cross multiply! :-D
{{{-15/x = -21/x-2}}}
This gives us:
{{{-15*(x-2)=-21*x}}}
Distribute the -15:
{{{-15x+30=-21x}}}
Move the -15x to the other side:
{{{30=-6x}}}
Divide both sides by -6:
{{{x=-5}}}
Yay!