`y/7 + (y-4)/3=2` find the value of y

If y^(2)-2y-3=0 , find the values of y.

If y = ( 4/5 )^-2 ÷ ( 1/4 )^2 , find the value of y

If x = 7 + 4 sqrt(3) , y = 7 - 4 sqrt(3) , find the value of (1)/(x^(2)) + (1)/(y^(2)) .

If y + 1/y = 7 , find the value of y^2 + 1/y^2

(i) x+2y=-7 and 3x-2y=-1, then find the value of x. (ii) If x+y=8 and 4y-x=2, then find the value of y. (iii) If 3x+5y=9 and 5x+3y=7, then find the value of x+y. (iv) If 3x-y=11 and x-3y=17, then find the value of x-y.

If y=(sqrt(3)+1)/(2) then find the value of 4y^(3)+2y^(2)-8y+10=