(1)x-18=72
x=72+18
x=90
(2)4.3+6x=73.3
6x=73.3-4.3
6x=69
x=11.5
(3)64-12x=28
12x=64-28
12x=36
x=3
(1)比x少18少的数是72
x-18=72
x=18+72
x=90
(2)4.3加上x的6倍是73.3
4.3+6x=73.3
6x=73.3-4.3
x=69÷6
x=11.5
(3)64减去x的12倍是28
64-12x=28
12x=64-28
x=36÷12
x=3
(1)x-18=72,x=90
(2)4.3+6X=73.3,x=11.5
(3)64-12X=28,x=3