5rt + tr
xz + 6xy
xyz - 3xt
6 asdf - asdf
3asd - 6 asd
kop - 2 pok + 3 pok
5abc + 6abc
-3xy + 4xy + 5xy
uiy + 7 uiy
7 trs +9 trs
no semejante
semejante
semejantes
