If `16,000=400(x+9)`, what is the value of x?

If 16x-2=30 , what is the value of 8x-4 ?

What is the value of x in 3sqrt(x)=9 ?

If (7(x+9))/(4)-1=41, what is the value of x-9 ?

(6)/(x)=(4)/(x-9) , what is the value of (x)/(18) ?

if x:5=9:5, then what is the value of x?

If 12x^2-21x+1=0 , then what is the value of 9x^2+(16x^2)^-1 ? यदि 12x^2-21x+1=0 है, तो 9x^2+(16x^2)^-1 का मान क्या होगा ?