Newd solving this problem7p+9t-3p-15t

For this case we have the following expression:

We must group similar terms:

We add similar terms taking into account that:

Equal signs are added and the same sign is placedDifferent signs are subtracted and the major sign is placed.

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .