m must be a positive integer, because it is the multiple, greater than 1
if m = 4, then m(3y+13) > 72
if m = 2:
then z+6 = 6y+26
from equation 1 into equation 2 : z + n = 3y +1 +2n
z = 6y+ 20 = 3y + 1 + n
n = 3y + 19
equation 2:
3y + 2(3y+12) +1 = 66
y = 3,
x = 7,
z = 38,
if m = 3,
following same as above,
n = 6y + 38
3y + 2(6y+38) + 1 = 66
15y + 77 = 66,
so y would be negative.