If `(x+5) : (x+7) = (x-1): (x+2)`, find the value of x.

For x=0, find the value of x^2 -5x+5

if a/3 =b/7 =(7a-2b)/x , then find the value of x.

If x-2y =-1 , 2x-y = 7 then find the value of x-y .

If 2x+y=-2,3x-y=7 then find the value of x.

If cos^2 x +7sinx=5 ,find values of sinx.

If 3x+5y=9,5x+3y=7 then find the value of x-y .

If y=tan^(-1)(1/(1+x+x^2))+tan^(-1)(1/(x^2+3x+3))+tan^(-1)(1/(x^2+5x+7))+ ....+ upto n terms, then find the value of y^(prime)(0)dot

For x=0, find the value of the polynomial x^2-5x+5