Question 454759
Expressions can't be solved. Equations are solved.
Expressions can be reduced, simplified, factored and many other things but not solved.
Do you mean
 (2x^2+x-15)/(2x^2-11x-21)*(6x+9)/(2x-5)/(3x-21)
?
(x+3)/(x-7)^2
or 
(x+3)/(x^2-14x+49)