(1)x÷6=5
x÷6×6=5×6
x=30;
(2)3.4x=17
3.4x÷3.4=17÷3.4
x=5;
(3)9x=10.8
9x÷9=10.8÷9
x=1.2
(4)x÷1.5=9
x÷1.5×1.5=9×1.5
x=13.5.