①2.4x﹣3=12
②0.7×(12.8﹣x)=3.5
③5x﹣3x=24.5.
(72+18+x)×5=540
x=
0.8(x+0.25)=1
5(x+4)=45
3(x+3)=18
5(x+2.4)=25.5
(6-2.5)x=14.7 x=
①x-4.5=3.5
②3x+2=20
③4x-21=35
④x÷7=2.1
⑤8x=72
⑥10x-64=36
⑦7x+7.2=28.2
⑧100x+35=40
⑨(18-x)×26=130