*5x+2.4=12.4 0.8x-0.2x=4.8 4x-9×1.2=1.2
12(x-0.6)=36
6x-1.2+0.5=4.112-5x=7.5
①= ②= ③= ④= ⑤= ⑥=
1- = + = 1- = - =
- = + = + = + =
①
②
③
④
①x+=
②-x=
③3x-=