Jawabanmu

2014-09-10T15:44:23+07:00
5z +3 - 2z -7
jawaba : 
5z - 2z =3z

+3 -7  = 4
jadi hasilnya 3z - 4
2014-09-10T15:50:35+07:00
(2z-7)-(5z+3) = 2z-7-5z+3 = 2z-5z-7+3 = -3z-4 Maaf kalo salah :)