hints, if you want them (in rot13)
6.5: gur rkvg zvtug uryc
6.5, second hint: gur birenyy funcr qbrfa'g arrq gb or 3 gvyrf gnyy, vs vg pbaarpgf gb gur rkvg vg fgnlf nobir gur ibvq
7.1: gurer vf n jnl gb orpbzr gjb gvyrf ybat
7.1, second hint: lbh pna znxr n funcr gung yrgf lbh pbaarpg gb gur fvatyr oybpx