collecting like terms :)

find the like terms for:

p+p+p =

s+s+s+s+s+s =

5m+6j+2m+3j =

2h+3i+2i+h =

6+2k+9f-k-7f =

5x*2 + 2x*2 + 4mn-2mn =

2pq+4ef+5pq-ef =

mxnxp =

5xr =

2xdxe =

txtxtxtxt =

qxqxtxt =

mx6xmxm =

pfxgh=

8e x eg=

y x 2m x yg =