You can put this solution on YOUR website! 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)