①x+=
②x-=
③+x=
④-x=1-
x÷0.2=7.2 △2x-3.42=6.4
138-x=57 4x+6x=18
①2x+52x=16.2
②5x﹣2.5x=50
③x﹣4.7=6.3
④32+6x=56
⑤4÷x=0.8
⑥x﹣0.6x=2.4