Могу первое.
Program more;
Uses crt;
var s,x,y,z:Real;
Begin;
clrscr;
write('Enter x: ');readln(x);
write('Enter y: ');readln(y);
write('Enter z: ');readln(z);
{debug}
if (x+y)=(x+z) then begin
writeln('X=Y=Z');
readKey;
exit;
end
{end debug}
s:=x;
if sif swriteln('MAX: ', s,'.');
readKey;
End.