Respuesta :
I assume you meant:
(3x+15)/(6-x)
The only time this fraction will be equal to zero is when the numerator is equal to zero.
3x+15=0 subtract 15 from both sides
3x=-15 divide both sides by 3
x=-5
(3x+15)/(6-x)
The only time this fraction will be equal to zero is when the numerator is equal to zero.
3x+15=0 subtract 15 from both sides
3x=-15 divide both sides by 3
x=-5