Can someone please help me with this question? (no links!!!)

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Plz heeeeeeelp plz give me the answer