解:3(x-4)◯□=18◯□
x-4=□
x-4◯□=□○□
x=□
解:(6x-12)×8◯□=48◯□
6x-12=□
6x-12◯□=□○□
6x=□
6x÷□=□○□
6(x-3)=24 (x+4)÷2=15
3x=9.12 (x-4.7)×5=12
33x-8x=150 16x+5.8=34.6
(3x-7)÷5=16 6.1-1.5x=3.85
4.8+x=10.3 x-5.6=1.05
4.5x=1.8 x÷1.2=3.5
4.5(x+9)=54 7.2x-5.8x=2.8
4x+6×6=42 (x-13.8)×2=67.8