87:(4х+5)=3   17*(3х-16)=85

87:(4х+5)=3
4х+5=87:3
4х+5=29
4х=24
х=6

17(3х-16)=85
51х-272=85
51х=85+272
51х=357
х=7

9(6х-13)=153
54х-117=153
54х=153+117
54х=270
х=5