Jawabanmu

2014-08-14T21:55:48+07:00
(4x+9) + (3x+6)= 7x+15

(p+2q-r) + 4(3p-2q+3r)= p+2q-r+12p-8q+12r
                               = 13p-6q+11r

2(2p-4q+3r) - 3(2p+3q-3r)
= 4p-8q+6r - 6p-9q+9r
=  -2p-17q+15r

(4x+8) - (3x+5)
= 4x+8-3x+5
= x+3