2x -3 =6
value of x
i don't know

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Interpret the following expression (5y^2-7)^3/(2y)^2

Which expression gives the exact value of x?